Isaiah 19:19, 21

In that day shall there be an altar to Jehovah in the midst of the land of Egypt, and a pillar at the border thereof to Jehovah.

And Jehovah shall be known to Egypt, and the Egyptians shall know Jehovah in that day; yea, they shall worship with sacrifice and oblation, and shall vow a vow unto Jehovah, and shall perform it.