Revelation 7:9-15: "9 After this I looked, and behold, a great multitude that no one could number, from every nation, from all tribes and peoples and languages, standing before the throne and before the Lamb, clothed in white robes, with palm branches in their hands, 10 and crying out with a loud voice, 'Salvation belongs to our God who sits on the throne, and to the Lamb!' 11 And all the angels were standing around the throne and around the elders and the four living creatures, and they fell on their faces before the throne and worshiped God, 12 saying, 'Amen! Blessing and glory and wisdom and thanksgiving and honor and power and might be to our God forever and ever! Amen.'
13 Then one of the elders addressed me, saying, 'Who are these, clothed in white robes, and from where have they come?' 14 I said to him, 'Sir, you know.' And he said to me, 'These are the ones coming out of the great tribulation. They have washed their robes and made them white in the blood of the Lamb.
15 'Therefore they are before the throne of God, and serve him day and night in his temple; and he who sits on the throne will shelter them with his presence.'"
Revelation 14:1-3: "1 Then I looked, and behold, on Mount Zion stood the Lamb, and with him 144,000 who had his name and his Father's name written on their foreheads. 2 And I heard a voice from heaven like the roar of many waters and like the sound of loud thunder. The voice I heard was like the sound of harpists playing on their harps, 3 and they were singing a new song before the throne and before the four living creatures and before the elders. No one could learn that song except the 144,000 who had been redeemed from the earth."
Ephesians 5:19: "addressing one another in psalms and hymns and spiritual songs, singing and making melody to the Lord with your heart"
Luke 1:46-55: "46 And Mary said, 'My soul magnifies the Lord, 47 and my spirit rejoices in God my Savior, 48 for he has looked on the humble estate of his servant. For behold, from now on all generations will call me blessed; 49 for he who is mighty has done great things for me, and holy is his name. 50 And his mercy is for those who fear him from generation to generation. 51 He has shown strength with his arm; he has scattered the proud in the thoughts of their hearts; 52 he has brought down the mighty from their thrones and exalted those of humble estate; 53 he has filled the hungry with good things, and the rich he has sent away empty. 54 He has helped his servant Israel, in remembrance of his mercy, 55 as he spoke to our fathers, to Abraham and to his offspring forever.'"
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The text is public domain:
Ye watchers and ye holy ones,Bright seraphs, cherubim, and thrones,Raise the glad strain: "Alleluia!"Cry out, dominions, princedoms, pow'rs,Virtues, arch-angels, angels' choirs:"Alleluia, alleluia!"Alleluia, alleluia, alleluia!"O higher than the cherubim,More glorious than the seraphim,Lead their praises: "Alleluia!"Thou bearer of the eternal Word,Most gracious, magnify the Lord:"Alleluia, alleluia!"Alleluia, alleluia, alleluia!"Respond, ye souls in endless rest,Ye patriarchs and prophets blest:"Alleluia, alleluia!"Ye holy Twelve, ye martyrs strong,All saints triumphant, raise the song:"Alleluia, alleluia!"Alleluia, alleluia, alleluia!"O friends, in gladness let us sing,Supernal anthems echoing:"Alleluia, alleluia!"To God the Father, God the Son,And God the Spirit, Three in One:"Alleluia, alleluia!"Alleluia, alleluia, alleluia!"
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The two passages from Revelation appear throughout the hymn but in a more general way.
The passage from Luke is referred to in the lines "Thou bearer of the eternal Word, / Most gracious, magnify the Lord" in the second verse, and Ephesians 5:19 appears in the lines "O friends, in gladness let us sing, / Supernal anthems echoing" in the fourth verse.
