Isaiah 19:22:

And the LORD shall smite Egypt: he shall smite and heal it: and they shall return even to the LORD, and he shall be intreated of them, and shall heal them.

Notes on Isaiah 19:22:

Egypt was Israel’s mortal enemy.  However, God said that he would heal Egypt when its people turned to Him.  If God is willing to do this for His enemies, surely He is willing to heal His own children!  (Under the New Covenant, you don’t have to entreat God for healing; you just need to receive healing.)