And it will be for a sign and for a witness to the LORD of hosts in the land of Egypt; for they will cry to the LORD because of the oppressors, and He will send them a Savior and a Mighty One, and He will deliver them.
Isaiah 19:20
Surrounding context
19:19 In that day there will be an altar to the LORD in the midst of the land of Egypt, and a pillar to the LORD at its border.
19:20 And it will be for a sign and for a witness to the LORD of hosts in the land of Egypt; for they will cry to the LORD because of the oppressors, and He will send them a Savior and a Mighty One, and He will deliver them.
19:21 Then the LORD will be known to Egypt, and the Egyptians will know the LORD in that day, and will make sacrifice and offering; yes, they will make a vow to the LORD and perform it.