Praise ye Jehovah, frequently rendered “Praise ye the LORD,” stands at the beginning of ten of the psalms (106, 111-113, 135, 146-150), hence called “hallelujah psalms.” From its frequent occurrence it grew into a formula of praise. The Greek form of the word (alleluia) is found in Rev. 19:1, 3, 4, 6.
Source:Easton's Bible Dictionary (1897)Public domain