Revelation 10:7

but when the seventh angel should speak, and the trumpet should sound, the mystery of God should be accomplish'd, as he hath declared to his servants the prophets.

Romans 16:25

Now to him that is able to establish you according to my gospel, and the preaching of Jesus Christ, conformable to the revelation of the mystery, which was kept secret from antient times, but now is laid open,

Luke 24:44-47

then he said, this is what I told you, while I was yet with you, that what has been written concerning me in the law of Moses, in the prophets, and in the psalms, must be all accomplished.

Acts 3:21

but must reside in heaven, till the time of the restitution of all things, of which God has spoken from the beginning by the mouth of his holy prophets.

Romans 11:25

I would not, brethren, have you ignorant of this secret, (for fear you should presume too much on your selves) that blindness has fallen upon a part of Israel, until the time when the Gentiles shall be fully come in.

Ephesians 3:3-9

having revealed to me the secret, I now mention'd in short,

Revelation 11:15-18

The seventh angel sounded, and there were great voices in heaven, crying, "the kingdom of this world is become the kingdom of our Lord, and of his Christ, and he shall reign for ever and ever."

Treasury of Scripture Knowledge

Summary

But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.

Bible References

In the

Revelation 11:15
The seventh angel sounded, and there were great voices in heaven, crying, "the kingdom of this world is become the kingdom of our Lord, and of his Christ, and he shall reign for ever and ever."

The mystery

Romans 11:25
I would not, brethren, have you ignorant of this secret, (for fear you should presume too much on your selves) that blindness has fallen upon a part of Israel, until the time when the Gentiles shall be fully come in.
Romans 16:25
Now to him that is able to establish you according to my gospel, and the preaching of Jesus Christ, conformable to the revelation of the mystery, which was kept secret from antient times, but now is laid open,
Ephesians 3:3
having revealed to me the secret, I now mention'd in short,

As he

Luke 24:44
then he said, this is what I told you, while I was yet with you, that what has been written concerning me in the law of Moses, in the prophets, and in the psalms, must be all accomplished.
Acts 3:21
but must reside in heaven, till the time of the restitution of all things, of which God has spoken from the beginning by the mouth of his holy prophets.