Exodus 8:15, 19, 32

But when Pharaoh saw that relief had come, he became stubborn. He refused to listen to Moses and Aaron, just as the LORD had predicted.

“This is the finger of God!” the magicians exclaimed to Pharaoh. But Pharaoh’s heart remained hard. He wouldn’t listen to them, just as the LORD had predicted.

But Pharaoh again became stubborn and refused to let the people go.