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 an instruction to readers/hearers to express appreciation to the Lord for what he has done (and so for who he is). (It appears at Psalm 111:1 and Psalm 112:1, and at Psalm 104:35, Psalm 105:45, etc.; it also frames Psalm 106:1–48, Psalm 113:1–9, Psalm 135:1–21, Psalm 146:1–150:6.) 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.