Revelation 8:6

Young's Literal Translation 1862

And the seven messengers who are having the seven trumpets did prepare themselves that they may sound;

Cross References

Matthew 26:17

And on the first `day' of the unleavened food came the disciples near to Jesus, saying to him, `Where wilt thou `that' we may prepare for thee to eat the passover?'

Revelation 8:2

and I saw the seven messengers who before God have stood, and there were given to them seven trumpets,