Say unto God, How terrible art thou in thy works! through the greatness of thy power shall thine enemies submit themselves unto thee. How terrible art thou - Consider the plagues with which he afflicted Egypt before he brought your fathers from their captivity, which obliged all his enemies to submit.
Thine enemies submit themselves - Literally, lie unto thee. This was remarkably the case with Pharaoh and the Egyptians. They promised again and again to let the people go, when the hand of the Lord was upon them: and they as frequently falsified their word.