exodus 8

15 But when Pharaoh saw that relief had come, he became stubborn.^[c] He refused to listen to Moses and Aaron, just as the Lord had predicted.

(When they saw that relief had come and their troubles were gone, they went back to doing what they were doing. They did not show true repentance. Repentance should not be attempted for relief so we can get back to business as usual. It requires the fruit of change with no return.)