Exodus 8:12-15

8:12 Then Moses and Aaron went out from Pharaoh, and Moses cried to the Lord because of the frogs that he had brought on Pharaoh. 8:13 The Lord did as Moses asked – the frogs died out of the houses, the villages, and the fields. 8:14 The Egyptians piled them in countless heaps, and the land stank. 8:15 But when Pharaoh saw that there was relief, he hardened his heart and did not listen to them, just as the Lord had predicted.