Exodus 9:5-7 English Standard Version (ESV)
5 And the Lord set a time, saying, “Tomorrow the Lord will do this thing in the land.” 6 And the next day the Lord did this thing. All the livestock of the Egyptians died, but not one of the livestock of the people of Israel died. 7 And Pharaoh sent, and behold, not one of the livestock of Israel was dead. But the heart of Pharaoh was hardened, and he did not let the people go.