Jewish ethics stands at the intersection of Judaism and the Western philosophical tradition of ethics. Like other types of religious ethics, the diverse literature of Jewish ethics primarily aims to answer a broad range of moral questions and, hence, may be classified as a normative ethics. For two millennia, Jewish thought has also grappled with the dynamic interplay between law and ethics. The tradition of rabbinic religious law (known as halakhah) addresses numerous problems often associated with ethics, including its semi-permeable relation with duties that are usually not punished under law.
Jewish ethics may be said to originate with the Hebrew Bible, its broad legal injunctions, wisdom narratives and prophetic teachings. Most subsequent Jewish ethical claims may be traced back to the texts, themes and teachings of the written Torah.
In early rabbinic Judaism, the oral Torah both interprets the Hebrew Bible and delves afresh into many other ethical topics. The best known rabbinic text associated with ethics is the non-legal Mishnah tractate of Avot (“forefathers”), popularly translated as “Ethics of the Fathers”. Similar ethical teachings are interspersed throughout the more legally-oriented portions of the Mishnah, Talmud and other rabbinic literature. Generally, ethics is a key aspect of non-legal rabbinic literature, known as aggadah. This early Rabbinic ethics shows signs of cross-fertilization and polemical exchange with both the Greek (Western philosophical) ethical tradition and early Christian tradition.
In the medieval period, direct Jewish responses to Greek ethics may be seen in major rabbinic writings. Notably, Maimonides offers a Jewish interpretation of Aristotle (e.g., Nicomachean Ethics), who enters into Jewish discourse through Islamic writings. Maimonides, in turn, influences Thomas Aquinas, a dominant figure in Catholic ethics and the natural law tradition of moral theology. The relevance of natural law to medieval Jewish philosophy is a matter of dispute among scholars.
Medieval and early modern rabbis also created a pietistic tradition of Jewish ethics (see references, below). This ethical tradition was given expression through the mussar literature. The Hebrew term mussar, while literally derived from a word meaning "tradition," is usually translated as ethics or morals.
In the modern period, Jewish ethics sprouted many offshoots, partly due to developments in modern ethics and partly due to the formation of Jewish denominations. Trends in modern Jewish normative ethics include:
In terms of descriptive ethics, the study of Jewish moral practices and theory is situated more in the disciplines of history and the social sciences than in ethics proper, with some exceptions (e.g., Newman 1998).
Monogamy is the ideal (Gen. ii. 24). Marriage within certain degrees of consanguinity or in relations arising from previous conjugal unions is forbidden; chastity is regarded as of highest moment (Ex. xx. 14; Lev. xviii. 18-20); and abominations to which the Canaanites were addicted are especially loathed.
Virtue is believed to flow from the recognition of God, therefore idolatry is the progenitor of vice and oppression.
The non-Israelite is within the covenant of ethical considerations (Ex. xxii. 20; Lev. xix. 33). "You shall love him as yourself," a law the phraseology of which proves that in the preceding "thou shalt love thy neighbor as thyself" (Lev. xix. 18) "neighbor" does not connote an Israelite exclusively. There was to be one law for the native and the stranger (Lev. xix. 34; comp. Ex. xii. 49). Non-Israelites were not forced to follow the Israelite faith.
The family plays a central role in Judaism, both socially and in transmitting the traditions of the religion. To honour one's father and mother is one of the Ten Commandments. Jewish families try to have close, respectful family relationships, with care for both the elderly and young. Religious observance is an integral part of home life, including the weekly Sabbath and keeping kosher dietary laws. The Talmud tells parents to teach their children a trade and survival skills, and children are asked to look after their parents.
Adultery, incest, and homosexuality are prohibited in the Torah (Leviticus 18:6–23). Prostitution is forbidden.
The reputation of a fellow man is sacred (Ex. 21:1). Tale-bearing and unkind insinuations are proscribed, as is hatred of one's brother in one's heart (Lev. 19:17). A revengeful, relentless disposition is unethical; reverence for old age is inculcated; justice shall be done; right weight and just measure are demanded; poverty and riches shall not be regarded by the judge (Lev. 19:15, 18, 32, 36; Ex. 23:3).
Even animals have a right to be treated well (Ex. 23:4), even ones that might belong to one's enemy.
The prophets preached that the people of Israel were chosen by God because of the virtues of the Patriarchs, having been "alone singled out" by God; in this view, choseness means that the Jewish nation's conduct is under more rigid scrutiny (Amos 3:1-2) than other nations. Israel is seen as the "wife" (Hosea), or the "bride" (Jer. 2:2-3) of God; in this view, the laws of Judaism are a covenant of love (Hosea 6:7). This leads to the corollary that idolatry is an adulterous abandoning of God. From this infidelity proceeds all manner of vice, oppression, untruthfulness. Fidelity, on the other hand, leads to "doing justly and loving mercy" (Micah 6:8).
Kindness to the needy, benevolence, faith, pity to the suffering, a peace-loving disposition, and a truly humble and contrite spirit, are the virtues which the Prophets hold up for emulation. Civic loyalty, even to a foreign ruler, is urged as a duty (Jer. 29:7). "Learn to do good" is the key-note of the prophetic appeal (Isa. 1:17); thus the end-time will be one of peace and righteousness; war will be no more (Isa. 2:2 et seq.)
Ben Azzai says: "The Torah, by beginning with the book of the generations of man, laid down the great rule for the application of the Law: Love thy neighbor as thyself" (Lev. 19:18; Midrash Genesis Rabbah 24)
Rabbi Simlai taught "Six hundred and thirteen commandments were given to Moses; then David came and reduced them to eleven in Psalm 15.; Isaiah (33:15), to six; Micah (6:8), to three; Isaiah again (56:1), to two; and Habakkuk (2:4), to one: 'The just lives by his faithfulness'."
Jewish ethics denies self-abasement. "He who subjects himself to needless self-castigations and fasting, or even denies himself the enjoyment of wine, is a sinner" (Taanit 11a, 22b). A person has to give account for every lawful enjoyment he refuses (Talmud Yer. Ḳid. iv. 66d).
Man is in duty bound to preserve his life (Berachot 32b) and his health. Foods dangerous to health are more to be guarded against than those ritually forbidden.
A person should show self-respect in regard to both his body, "honoring it as the image of God" (Hillel: Midrash Leviticus Rabbah 34), and his garments (Talmud Shabbat 113b; Ned. 81a).
One must remove every cause for suspicion in order to appear blameless before men as well as before God (Yoma 38a).
Man is enjoined to take a wife and obtain posterity (Yeb. 63b; Mek., Yitro, 8). "He who lives without a wife lives without joy and blessing, without protection and peace"; he is "not a complete man" (Yeb. 62a, 63a), and for it he has to give reckoning at the great Judgment Day (Shab. 31a).
The Talmud denounces as fraud every mode of taking advantage of a man's ignorance, whether he be Jew or Gentile; every fraudulent dealing, every gain obtained by betting or gambling or by raising the price of breadstuffs through speculation, is theft (B. B. 90b; Sanh. 25b). The Talmud denounces advantages derived from loans of money or of victuals as usury; every breach of promise in commerce is a sin provoking God's punishment; every act of carelessness which exposes men or things to danger and damage is a culpable transgression.
The Talmud extends far beyond Biblical statutes responsibility for every object given into custody of a person or found by him. A rabbi in the Talmud opines that putting one's fellow man to shame, in the same category as murder (B. M. 58b), and brands as calumny the spreading of evil reports, even when true. Also forbidden is listening to slanderous gossip, or the causing of suspicion, or the provoking of unfavorable remarks about a neighbor.
"A good deed brought about by an evil deed is an evil deed" (Suk. 30a).
The Jewish concept of peace, or shalom, is not a passive ideal, but can only be achieved through truth, justice, and mercy. Aaron, the elder brother of Moses, is regarded as a role model for maintaining peace between individuals. He would go separately to two quarrelling individuals and tell them how much the other wanted to make peace between them. Jews believe that they should always work for reconciliation, and that the same ethics apply between nations. They believe that war is avoidable if justice prevails, and should be avoided if at all possible. However, defence, particularly of life, home, or belief, is permissible if other attempts at resolution have failed. War fought to build an empire or take revenge on others is strictly forbidden. Jews are expected to treat their enemies with care and thought (Proverbs 25:21, Kings 2 6:21–23).
Peace is everywhere recommended, and urged as the highest boon of man (Midrash Numbers Rabbah xi.; Talmud Pesachim i. 1.) Hatred, quarreling and anger are condemned as unethical, and potentially leading to murder.
From the thought of a holy God emanated four virtues: (a) Chastity ("tzeniut" = "modesty"), which shuts the eye against unseemly sights and the heart against impure thoughts. Hence R. Meïr's maxim (Ber. 17a): "Keep your mouth from sin, your body from wrong, and I {God} will be with thee." (b) Humility. The presence of God rests only upon the humble (Mek., Yitro, 9; Ned. 38), whereas the proud is like one who worships another god and drives God away (Soṭah 4b). (c) Truthfulness. "Liars, mockers, hypocrites, and slanderers can not appear before God's face" (Sotah 42a). (d) Reverence for God. "Fear of God leads to fear of sin" (Ber. 28b), and includes reverence for parents and teachers.
The Rabbis decreed against Essene practice, and against advice given in the New Testament, that one give away much, most or all of their possessions. Since they did not expect a supernatural savior to come and take care of the poor, they held that one must not make themselves poor. Given that nearly all Jews of their day were poor or middle-class (even the rich of that time were only rich relative to the poor), they ruled that one should not give away more than a fifth of his income to charity, while yet being obligated to give away no less than 10% of his income to charity (Ket. 50a; 'Ar. 28a). Many folios of the Talmud are devoted to encouragement in giving charity (see, for example, B.B. 9b-11a; A.Z. 17b; Pes. 8a; Rosh. 4a), and this topic is the focus of many religious books and rabbinic responsa.
Jews do not actively convert others to Judaism; in fact conversion to Judaism is a lengthy and difficult process. They are respectful of other religions, but cannot actively approve of religions that appear to promote idolatry or immorality.
Jews believe that Gentiles who follow the Noachide code, the minimum ethical and religious requirements for all non-Jews, will be equally recognized by God. The laws of the Noachide code are: do not engage in idolatry; do not engage in blasphemy; do not murder; do not steal; do not commit acts of sexual immorality; do not cause excessive pain to animals (e.g. eating a limb torn from a living animal); and establish courts of justice.
The greatest sin of fraud, therefore, is that committed against a non-Israelite, because it leads to the reviling of God's name. The desire to sanctify the name of God leads one to treat adherents of other creeds with the utmost fairness and equity.
Respect for one's fellow creatures is of such importance that Biblical prohibitions may be transgressed on its account (Ber. 19b). Especially do unclaimed dead require respectful burial (see Burial in Jew. Encyc. iii. 432b: "met miẓwah"). Gentiles are to have a share in all the benevolent work of a township which appeals to human sympathy and on which the maintenance of peace among men depends, such as supporting the poor, burying the dead, comforting the mourners, and even visiting the sick (Tosef., Giṭ. v. 4-5; Giṭ. 64a).
Friendship is highly prized in the Talmud; the very word for "associate" is "friend" ("chaver"). "Get thyself a companion" (Abot i. 6). "Companionship or death" (Ta'an. 23a).
Trees and other things of value also come within the scope of rabbinical ethics, as their destruction is prohibited, according to Deut. xx. 19 (Talmud, tracate Shabbat 105b, 129a, 140b, et al.)
Consideration for animals is an important part of Judaism. It is part of the Noachide code. Resting on the Sabbath also meant providing rest for the working animals, and people are instructed to feed their animals before they sit down to eat. At harvest time, the working animals must not be muzzled, so that they can eat of the harvest as they work. All animals must be kept in adequate conditions. Sports like bullfighting are forbidden. Animals may be eaten as long as they are killed as painlessly and humanely as possible using the method known as shechitah, where the animal is killed by having its throat cut swiftly using a specially sharpened knife. Jewish butchers have a special training in this which must meet the requirements of kashrut. Animals may also be used in medical research if it will help people in need, and if the animals do not undergo any unnecessary suffering.