Revelation 17:11

the beast that was, and is not, is himself the eighth: he is of the seven, and shall be destroy'd.

Revelation 17:8

the beast that thou sawest, was, and is not; and shall ascend out of the bottomless pit, and go into perdition: and they that dwell on the earth, whose names were not written in the book of life from the foundation of the world, shall wonder when they behold the beast that was, and is not, but shall be.

Treasury of Scripture Knowledge

Summary

And the beast that was, and is not, even he is the eighth, and is of the seven, and goeth into perdition.

That was

Bible References

That was

Revelation 17:8
the beast that thou sawest, was, and is not; and shall ascend out of the bottomless pit, and go into perdition: and they that dwell on the earth, whose names were not written in the book of life from the foundation of the world, shall wonder when they behold the beast that was, and is not, but shall be.