I now plainly see and freely acknowledge my sin in striving with God. He seems not to deny that he had sinned before, for even the light of nature would discover his sin, in breaking his faith, and the word of a King given to Moses for Israel's dismission.
Related Commentaries of Exodus 9:27
Exodus 9:27
27 And Pharaoh sent, and called for Moses and Aaron, and said unto them, I have sinned this time: the LORD is righteous, and I and my people are wicked.