Revelation 8:6

King James 3 - The Literal Traslation

And the seven angels, the ones having the seven trumpets, prepared themselves, that they might sound the trumpets.

Cross References

Matthew 26:17

And on the first day of the Feast of Unleavened Bread, the disciples came to Jesus, saying to Him, Where do you desire we should prepare for You to eat the Passover?

Revelation 8:2

And I saw the seven angels who stood before God, and seven trumpets were given to them.