Isaiah 19:20-21

It will be a sign and witness to the LORD Almighty in the land of Egypt. When they cry out to the LORD because of their oppressors, he will send them a savior and defender, and he will rescue them. So the LORD will make himself known to the Egyptians, and in that day they will acknowledge the LORD. They will worship with sacrifices and grain offerings; they will make vows to the LORD and keep them.