A sacred hymn is a song of praise or worship to a deity. The term 'sacred hymn' can be used to refer to any type of religious song, including those found in the Bible. One example of a sacred hymn is the PSALM, which is a collection of 150 poems and songs found in the Old Testament of the Bible. The Psalms are often used in Christian worship services and are considered to be some of the most important pieces of literature in the Bible.