2 Thessalonians 2:7

For the mystery of lawlessness already works; only there is he who restrains now until he be gone,

Revelation 17:5

and upon her forehead a name written, Mystery, great Babylon, the mother of the harlots, and of the abominations of the earth.

Revelation 17:7

And the angel said to me, Why hast thou wondered? I will tell thee the mystery of the woman, and of the beast which carries her, which has the seven heads and the ten horns.

1 John 2:18

Little children, it is the last hour, and, according as ye have heard that antichrist comes, even now there have come many antichrists, whence we know that it is the last hour.

1 John 4:3

and every spirit which does not confess Jesus Christ come in flesh is not of God: and this is that power of the antichrist, of which ye have heard that it comes, and now it is already in the world.

Acts 20:29

For I know this, that there will come in amongst you after my departure grievous wolves, not sparing the flock;

Colossians 2:18-23

Let no one fraudulently deprive you of your prize, doing his own will in humility and worship of angels, entering into things which he has not seen, vainly puffed up by the mind of his flesh,

1 Timothy 3:16

And confessedly the mystery of piety is great. God has been manifested in flesh, has been justified in the Spirit, has appeared to angels, has been preached among the nations, has been believed on in the world, has been received up in glory.

2 Timothy 2:17-18

and their word will spread as a gangrene; of whom is Hymenaeus and Philetus;

Treasury of Scripture Knowledge

Summary

For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way.

Bible References

The mystery

1 Timothy 3:16
And confessedly the mystery of piety is great. God has been manifested in flesh, has been justified in the Spirit, has appeared to angels, has been preached among the nations, has been believed on in the world, has been received up in glory.
Revelation 17:5
and upon her forehead a name written, Mystery, great Babylon, the mother of the harlots, and of the abominations of the earth.

Doth

Acts 20:29
For I know this, that there will come in amongst you after my departure grievous wolves, not sparing the flock;
Colossians 2:18
Let no one fraudulently deprive you of your prize, doing his own will in humility and worship of angels, entering into things which he has not seen, vainly puffed up by the mind of his flesh,
2 Timothy 2:17
and their word will spread as a gangrene; of whom is Hymenaeus and Philetus;
1 John 2:18
Little children, it is the last hour, and, according as ye have heard that antichrist comes, even now there have come many antichrists, whence we know that it is the last hour.
1 John 4:3
and every spirit which does not confess Jesus Christ come in flesh is not of God: and this is that power of the antichrist, of which ye have heard that it comes, and now it is already in the world.

He who

2 Thessalonians 2:6
And now ye know that which restrains, that he should be revealed in his own time.