The term is a Greek transliteration of a Hebrew word that means “Praise the Lord” (hallelu = plural imperative of the verb to praise; jah = Yahweh, Lord). This term appears in numerous psalms as instruction to readers/hearers to express appreciation to the Lord for what he has done (and so for who he is). (It appears at the beginning of Pss. 111 and 112, and concludes Pss. 104, 105, 115–117; it also frames Pss. 106, 113, 135, 146–150.) Revelation 19 is the only place in the New Testament where this term appears (4x). Whereas in the Old Testament this summons was repeatedly directed to worshippers in the temple of Jerusalem (where God dwelt in the Most Holy Place), now the summons comes from those who share God’s heavenly dwelling.