psalm

Definition

A psalm is a sacred song, often a poem set to music. The Old Testament book of Psalms has a collection of these songs written by the Israelites.

Both Moses and King David wrote psalms that were used by the nation of Israel in their worship of God.
Psalms can be used to express joy, faith and reverence, as well as pain and sorrow.
In the New Testament, Christians are instructed to sing psalms to God as a form of worship.