Revelation 10:7

but in the day of the voice of the seventh angel, when he is about to sound, and the mystery of God may be finished, when he has preached the gospel to his servants the prophets.

Romans 16:25

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 having been hidden during the eternal times,

Luke 24:44-47

And He said to them, These are my words which I spoke to you, being still with you, that it behooves all things which have been written concerning me in the law of Moses, and the prophets, and the Psalms, to be fulfilled.

Acts 3:21

whom it behooves heaven indeed to receive until the times of the restitution of all things which God spoke through the mouth of all his prophets from the beginning.

Romans 11:25

I do not wish you to be ignorant, brethren, as to this mystery, in order that you may not he wise with yourselves, that blindness in part has happened unto Israel, until the fulness of the Gentiles may come in;

Revelation 11:15-18

And the seventh angel sounded; and there were great voices in the heaven, saying, The kingdom of this world has become the kingdom of our Lord, and his Christ; and he will reign until the ages of the ages.

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 were great voices in the heaven, saying, The kingdom of this world has become the kingdom of our Lord, and his Christ; and he will reign until the ages of the ages.

The mystery

Romans 11:25
I do not wish you to be ignorant, brethren, as to this mystery, in order that you may not he wise with yourselves, that blindness in part has happened unto Israel, until the fulness of the Gentiles may come in;
Romans 16:25
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 having been hidden during the eternal times,

As he

Luke 24:44
And He said to them, These are my words which I spoke to you, being still with you, that it behooves all things which have been written concerning me in the law of Moses, and the prophets, and the Psalms, to be fulfilled.
Acts 3:21
whom it behooves heaven indeed to receive until the times of the restitution of all things which God spoke through the mouth of all his prophets from the beginning.