Jah occurs 50 times in the Hebrew Scriptures, 26 times alone, and 24 times in the expression “Hallelujah,” which is, literally, a command to a number of people to “praise Jah.”

In the Christian Greek Scriptures “Jah” appears four times in the expression Hallelujah. (Re 19:1, 3, 4, 6) Most Bibles simply carry this Greek expression over into English untranslated, but G. W. Wade renders it, “Praise ye Jehovah,” and the New World Translation reads, “Praise Jah, you people!”

The phrase, “Praise Jah, you people!” (Hallelujah) appears as a doxology, that is, an expression of praise to God, in the Psalms, the first being at Psalm 104:35. In other psalms it may be at the beginning only (Ps 111, 112), occasionally within a psalm (135:3), sometimes at the end only (Ps 104, 105, 115-117), but often at both the beginning and the end (Ps 106, 113, 135, 146-150). In the book of Revelation heavenly personages repeatedly punctuate their praise of Jehovah with this expression.​—Re 19:1-6.