Revelation 8:1

Then when the Lamb broke open the seventh seal, there was silence in heaven for about half an hour.

Revelation 6:1

And I watched while the Lamb broke open one of the seven seals. Then I heard one of the four living beings saying in a thunderous voice [to the one on the white horse ?], "Come [out]."

Revelation 5:1

Then I saw in the right hand of God, who sat on His throne, a book with writing on the inside and on the back, and sealed with seven seals.

Revelation 6:3

And when the Lamb broke open the second seal, I heard the second living being saying [to the one on the red horse ?], "Come [out]."

Revelation 6:5

And when the Lamb broke open the third seal, I heard the third living being saying [to the one on the black horse ?], "Come [out]." So, I looked and before me [stood] a black horse, and the man riding on it had a pair of scales in his hand.

Revelation 6:7

And when the Lamb broke open the fourth seal, I heard the fourth living being saying [to the one on the pale green horse ?], "Come [out]."

Revelation 6:9

And when the Lamb broke open the fifth seal, I saw underneath the altar the souls of those who had been killed for [believing and preaching] God's message, and for the testimony [about Jesus] which they had maintained.

Revelation 6:12

Then I looked as the Lamb broke open the sixth seal, and there [I saw] a great earthquake; the sun turned as black as sackcloth made out of [goat] hair, and the entire moon turned [as red] as blood.

Revelation 5:9

And they sang a new song [which went like this]: "You deserve to take the book and break the seals on it, for you were killed and, with your blood, you purchased people for God from every tribe and language and race and nation,

Treasury of Scripture Knowledge

Summary

And when he had opened the seventh seal, there was silence in heaven about the space of half an hour.

Bible References

And

Revelation 5:1
Then I saw in the right hand of God, who sat on His throne, a book with writing on the inside and on the back, and sealed with seven seals.
Revelation 6:1
And I watched while the Lamb broke open one of the seven seals. Then I heard one of the four living beings saying in a thunderous voice [to the one on the white horse ?], "Come [out]."