7:15 Beware of false prophets, which come to you in sheep's
clothing, but inwardly they are ravening wolves.
7:16 Ye shall know them by their fruits. Do men gather grapes of
thorns, or figs of thistles?
7:17 Even so every good tree bringeth forth good fruit; but a
corrupt tree bringeth forth evil fruit.
7:18 A good tree cannot bring forth evil fruit, neither can a
corrupt tree bring forth good fruit.
7:19 Every tree that bringeth not forth good fruit is hewn down,
and cast into the fire.
7:20 Wherefore by their fruits ye shall know them.
From Luke 6:43-45 (KJV):
6:43 For a good tree bringeth not forth corrupt fruit; neither doth
a corrupt tree bring forth good fruit.
6:44 For every tree is known by his own fruit. For of thorns men do
not gather figs, nor of a bramble bush gather they grapes.
6:45 A good man out of the good treasure of his heart bringeth
forth that which is good; and an evil man out of the evil treasure
of his heart bringeth forth that which is evil: for of the
abundance of the heart his mouth speaketh.
A similar passage appears in the Gospel of Thomas (Patterson-Meyer Translation):
43. His disciples said to him, "Who are you to say these things to
"You don't understand who I am from what I say to you.
Rather, you have become like the Judeans, for they love the tree
but hate its fruit, or they love the fruit but hate the tree."
It is also interesting to note that makes a reference to one of Aesop's Fables, "The Wolf in Sheep's Clothing". Neither Luke nor Thomas includes this additional line, so it appears that this was added by Matthew himself.