Revelation 9:13

An Understandable Version (2005 edition)

And the sixth angel sounded its trumpet, and I heard a voice coming from the four horns [i.e., corners] of the golden Altar, which is in front of God.

Cross References

Revelation 9:1

[When] the fifth angel sounded its trumpet, I saw a star that had fallen from the sky to the earth. And the key to the shaft leading to the deep pit [Note: This is thought to be the place where the devil and his demons live] was given to him.

Hebrews 10:21

and since we have a great Priest [who is] over God’s household [i.e., Christ],

Hebrews 9:24

For Christ did not enter the Holy of Holies made by hand, which is [only] a counterpart of the true one, but into heaven itself, where He now appears in God’s presence for us. [See verse 12].

Revelation 8:2

And I saw the seven angels who were standing in front of God, and they were given seven trumpets.