The beast that was, and is not, is himself also the eighth, and is of the seven, and is going to perdition.
Revelation 17:11
Surrounding context
17:10 There are also seven kings. Five have fallen, one is, and the other has not yet come. And when he comes, he must continue a short time.
17:11 The beast that was, and is not, is himself also the eighth, and is of the seven, and is going to perdition.
17:12 "The ten horns which you saw are ten kings who have received no kingdom as yet, but they receive authority for one hour as kings with the beast.