Revelation 10:7

but in the days of the voice of the seventh angel, when he is about to sound, then should be finished the mystery of God, as he declared the glad tidings to his servants the prophets.

Romans 16:25

Now to him who is able to establish you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery which for eternal ages was unrevealed,

Luke 24:44-47

And he said to them, These are my words which I spoke to you, while I was yet with you, that all things must be fulfilled which are written in the Law of Moses, and the Prophets, and the Psalms, concerning me.

Acts 3:21

whom heaven indeed must receive until the times of a restoration of all things; of which times God spoke by the mouth of his holy prophets from the days of old.

Romans 11:25

For I would not have you ignorant, brethren, of this mystery, lest ye should be wise in your own conceits, that blindness hath to some extent come upon Israel, until the fullness of the gentiles shall have come in.

Ephesians 3:3-9

that by revelation the mystery was made known to me, as I wrote before in few words,

Revelation 11:15-18

And the seventh angel sounded, and there followed loud voices in heaven, saying, The kingdom of the world is become the kingdom of our Lord and of his Christ, and he will 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
And the seventh angel sounded, and there followed loud voices in heaven, saying, The kingdom of the world is become the kingdom of our Lord and of his Christ, and he will reign for ever and ever.

The mystery

Romans 11:25
For I would not have you ignorant, brethren, of this mystery, lest ye should be wise in your own conceits, that blindness hath to some extent come upon Israel, until the fullness of the gentiles shall have come in.
Romans 16:25
Now to him who is able to establish you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery which for eternal ages was unrevealed,
Ephesians 3:3
that by revelation the mystery was made known to me, as I wrote before in few words,

As he

Luke 24:44
And he said to them, These are my words which I spoke to you, while I was yet with you, that all things must be fulfilled which are written in the Law of Moses, and the Prophets, and the Psalms, concerning me.
Acts 3:21
whom heaven indeed must receive until the times of a restoration of all things; of which times God spoke by the mouth of his holy prophets from the days of old.