Revelation 17:10-12 NIV

10 They are also seven kings. Five have fallen, one is, the other has not yet come; but when he does come, he must remain for a little while.
11 The beast who once was, and now is not,1 is an eighth king. He belongs to the seven and is going to his destruction.

References for Revelation 17:11

      12 "The ten horns2 you saw are ten kings who have not yet received a kingdom, but who for one hour3 will receive authority as kings along with the beast.

      References for Revelation 17:12