Revelation 5:11
And I beheld, and I heard the voice of many angels round about the throne and the beasts and the elders: and the number of them was ten thousand times ten thousand, and thousands of thousands;
Cross-reference
In Revelation 19:6, this same multitude of angels cries 'Hallelujah' — both scenes depict a vast angelic choir worshiping God.
Revelation 7:11 also depicts angels standing around the throne in worship — a direct parallel to the countless angels here.
Revelation 4:10 shows the elders worshiping — another group joining the worship of the Lamb described here.
Revelation 4:9 shows the living creatures giving glory — a parallel worship activity to the angels' praise here.
In Daniel 7:10, thousands of thousands and ten thousand times ten thousand stand before the Ancient of Days — a direct parallel to this angelic multiplicity.
In Hebrews 12:22, believers come to 'innumerable angels in festal gathering' — the same countless angelic assembly surrounding God's throne.
In Deuteronomy 33:2, God comes with ten thousands of holy ones — this same imagery of myriads of angels surrounding God appears here.
Psalm 148:2 commands angels to praise God — exactly what the myriads of angels are doing in this scene.
In Psalm 68:17, God's chariots are tens of thousands — this same vision of countless angels attending God is echoed here.
1 Kings 22:19 shows the heavenly host standing around God's throne — the same OT image of angelic attendance seen here.
Psalm 97:7 commands 'worship him, all you gods' (angels), a direct call to angelic worship echoed in Revelation.
Luke 2:13 depicts the angelic host praising God at Jesus' birth — directly parallel to the multitude of angels worshiping the Lamb here.
Hebrews 1:4 declares Christ superior to angels — Revelation shows angels worshiping Him, confirming His supremacy.
Psalm 29:1 calls heavenly beings to ascribe glory to God, echoing the angelic worship scene in Revelation.
Job 38:7 depicts angels (sons of God) singing at creation, paralleling the angelic praise of the Lamb in Revelation.
In Job 25:3, God's armies are numberless — this same point about the countless angelic host is echoed here.
In Nehemiah 9:6, the host of heaven worships God — this same truth of angelic worship is affirmed here.
Hebrews 2:8 says all things are under Christ's feet — Revelation shows the Lamb receiving universal worship.
1 Peter 1:12 notes angels desire to look into salvation — Revelation shows them worshiping the Lamb who accomplished it.