Books of the Bible Psalms The Book of Psalms is the most ancient collection of poetry in the world. Set to music, it served as the hymnbook for the Israelites and early church in praise and worship of YHVH, the LORD. Rather than rhythm and rhyme, it uses clarification, contrasts, comparisons, and repetition. The Psalms have provided comfort, encouragement and strength for over a thousand years. Delight yourself in the law of the LORD, meditate on it day and night, and plant yourself by the rivers of water!