Hallelujah
“Then I heard what seemed to be the voice of a great multitude, like the roar of many waters and like the sound of mighty peals of thunder, crying out, “Hallelujah! For the Lord our God the Almighty reigns.” (Rev. 19:6 ESV)
Hallelujah: Hebrew hallĕlūyāh praise (ye) the Lord ; to express praise, joy, or thanks; a shout or song of praise or thanksgiving; glory (or glory be), ha (or hah), hey, hooray (also hurrah), hot dog, huzzah, wahoo [chiefly West], whee, whoopee, yahoo, yippee.
Hallelujah – praise &worship to God
“Once more they cried out, “Hallelujah! The smoke from her goes up forever and ever.” And the twenty-four elders and the four living creatures fell down and worshiped God who was seated on the throne, saying, “Amen. Hallelujah!” (Rev. 19:3-4 ESV)
A great multitude in heaven, crying out, “hallelujah!”
“After this I heard what seemed to be the loud voice of a great multitude in heaven, crying out, “Hallelujah! Salvation and glory and power belong to our God…” (Rev. 19:1 ESV)
Therefore…
“Praise the Lord, all nations! Extol him, all peoples! For great is his steadfast love toward us, and the faithfulness of the Lord endures forever. Praise the Lord!” (Psalm 117:1-2 ESV)