Psalm 18
Psalm 18 is the 18th psalm of the Book of Psalms. In the slightly different numbering system used in the Greek Septuagint and Latin Vulgate translations of the Bible, this psalm is Psalm 17. It is almost identical to 2 Samuel 22, although verse 1 of the psalm, "I love you, O LORD, my strength", is not included in the 2 Samuel version. With 50 verses, this is the longest psalm in Book 1 of the Book of Psalms (Psalms 1-41). The Jerusalem Bible describes this psalm as "a triumphal ode combining a thanksgiving prayer ... with a  royal victory song, ending on a messianic note". According to Charles and Emilie Briggs in the "International Critical Commentary" series, this psalm borrowed material from 2 Samuel 22, which may have been written by David himself, with later additions by multiple editors adapting it for use in public worship. This psalm is one of a number of psalms which refer to God as a "rock" and a "fortress". Text. This psalm, in the English Standard Version, reads: Introduction: The LORD Is My Rock and My Fortress To the choirmaster. A Psalm of David, the servant of the LORD, who addressed  the words of this song to the LORD on the day when the LORD rescued him from the hand of all his enemies, and from the hand of Saul. He said: Usage. New Testament. Some verses of Psalm 18 are referenced in the New Testament: Book of Common Prayer. In the Church of England's "Book of Common Prayer", Psalm 18 is appointed to be read on the evening of the third day of the month.