1 I saw when the Lamb opened one of the seven seals, and I heard one of the four living creatures saying, as with a voice of thunder, "Come."
Revelation 6:1 Cross References - NHEB
Acts 4:20
20 for we cannot help telling the things which we saw and heard."
Revelation 4:5-7
5 And from the throne came flashes of lightning and sounds and peals of thunder. And there were seven torches of fire burning before the throne, which are the seven Spirits of God.
6 Before the throne was something like a sea of glass, similar to crystal. In the midst of the throne, and around the throne were four living creatures full of eyes before and behind.
7 The first living creature was like a lion, and the second living creature like a calf, and the third living creature had a face like a man, and the fourth living creature was like a flying eagle.
Revelation 5:1
1 I saw, in the right hand of him who sat on the throne, a scroll written inside and on the back, sealed shut with seven seals.
Revelation 5:5-7
5 One of the elders said to me, "Do not weep. Look, the Lion who is of the tribe of Judah, the Root of David, has overcome so that he can open the scroll and loose its seven seals."
6 I saw in the midst of the throne and of the four living creatures, and in the midst of the elders, a Lamb standing, as though it had been slain, having seven horns, and seven eyes, which are the seven Spirits of God, sent out into all the earth.
7 Then he came, and he took it out of the right hand of him who sat on the throne.
Revelation 6:3
3 When he opened the second seal, I heard the second living creature saying, "Come."
Revelation 6:5
5 When he opened the third seal, I heard the third living creature saying, "Come." And I saw, and suddenly there was a black horse and he who sat on it had a balance in his hand.
Revelation 6:7
7 When he opened the fourth seal, I heard the fourth living creature saying, "Come."
Revelation 10:3-4
Revelation 11:19
19 God's temple that is in heaven was opened, and the ark of his covenant was seen in his temple. Lightnings, sounds, thunders, an earthquake, and great hail followed.
Revelation 14:2
2 I heard a sound from heaven, like the sound of many waters, and like the sound of a great thunder. The sound which I heard was like that of harpists playing on their harps.
Revelation 19:6
6 I heard something like the voice of a great multitude, and like the voice of many waters, and like the voice of mighty thunders, saying, "Hallelujah. For the Lord our God of hosts reigns.