Revelation 9:13

And the sixth angel sounded the trumpet, and I heard a voice from the four horns of the golden altar which is before the presence of God,

Exodus 30:2-3

Its length shall be a cubit and its width a cubit; it shall be square and its height two cubits; its horns shall be of the same.

Hebrews 9:24

For Christ is not entered into the sanctuary made with hands (which is a figure of the true), but into the heaven itself, now to appear in the presence of God for us,

Hebrews 10:21

and having that great priest over the house of God,

Revelation 8:3-5

And another angel came and stood at the altar, having a golden censer; and there was given unto him much incense of the prayers of all the saints, that he should offer upon the golden altar which was before the throne.

Revelation 9:1

And the fifth angel sounded the trumpet, and I saw a star fall from heaven unto the earth; and to him was given the key of the bottomless pit.

Treasury of Scripture Knowledge

Summary

And the sixth angel sounded, and I heard a voice from the four horns of the golden altar which is before God,

The sixth

Bible References

The sixth

Revelation 9:1
And the fifth angel sounded the trumpet, and I saw a star fall from heaven unto the earth; and to him was given the key of the bottomless pit.

A voice

Revelation 8:3
And another angel came and stood at the altar, having a golden censer; and there was given unto him much incense of the prayers of all the saints, that he should offer upon the golden altar which was before the throne.
Hebrews 9:24
For Christ is not entered into the sanctuary made with hands (which is a figure of the true), but into the heaven itself, now to appear in the presence of God for us,
Hebrews 10:21
and having that great priest over the house of God,