2 Thessalonians 2:7 For the mystery of lawlessness is already at work; only he who now restrains will do so until he is taken out of the way.

Revelation 1:20 "As for the mystery of the seven stars which you saw in My right hand, and the seven golden lampstands: the seven stars are the angels of the seven churches, and the seven lampstands are the seven churches.

Revelation 17:3 And he carried me away in the Spirit into a wilderness; and I saw a woman sitting on a scarlet beast, full of blasphemous names, having seven heads and ten horns.

Revelation 17:5 and on her forehead a name was written, a mystery, "BABYLON THE GREAT, THE MOTHER OF HARLOTS AND OF THE ABOMINATIONS OF THE EARTH." (NASB ©1995)