The Hebrew imperative summons to praise the LORD — halal-yah (praise YHWH). The most concentrated worship-word in Scripture, used throughout the Psalms (24 times, mostly in Pss 104-118 and 146-150). Psalm 150 alone has the word four times. The NT preserves the Hebrew transliterated (hallelouia) without translation, preserving the word's ancient power. Revelation 19:1, 3, 4, 6 thunders the word four times at the climactic wedding of the Lamb — the only place in the NT where Hallelujah appears, fittingly at the eschatological consummation. The Hallel (Psalms 113-118, sung at Passover and other festivals) was almost certainly what Christ and the disciples sang after the Last Supper (Matt 26:30: when they had sung an hymn, they went out into the mount of Olives). The Christian inheritance includes the same word, the same praise, the same orientation: Hallelujah is the church's eternal vocabulary.