Psalm 100 (Greek numbering: Psalm 99) is part of the biblical Book of Psalms. It may be used as a canticle in the Anglican liturgy of Morning Prayer, when it is referred to by its incipit as the Jubilate or Jubilate Deo. It also constitutes the bulk of the first movement of Leonard Bernstein's Chichester Psalms.
In Judaism, Psalm 100 is part of the daily prayer service, except on Shabbat, festivals, Chol HaMoed of Pesach, and the days before Yom Kippur and Pesach. Psalm 100 is representative of the Thanksgiving offering, which thanks God for having been saved from dangers we face every day. A person always faces danger in his daily routine, even though he may be unaware of it.
Psalm 100 is omitted the day before and during Pesach because the Thanksgiving offering is composed of a loaf of bread, which is chametz that may not be consumed during Pesach. It is omitted the day before Yom Kippur because no food is consumed on Yom Kippur.
Psalm 100 (often under its Latin incipit "Jubilate Deo") has been set to music by many composers, sometimes more than once. Some notable compositions are those by: