Then the Lord said to Moses, "Go to Pharaoh, and say to him, 'Thus says the Lord, the God of the Hebrews: Let my people go, so that they may worship me. For if you refuse to let them go and still hold them, the hand of the Lord will strike with a deadly pestilence your livestock in the field: the horses, the donkeys, the camels, the herds, and the flocks. But the Lord will make a distinction between the livestock of Israel and the livestock of Egypt, so that nothing shall die of all that belongs to the Israelites.'" The Lord set a time, saying, "Tomorrow the Lord will do this thing in the land." And on the next day the Lord did so; all the livestock of the Egyptians died, but of the livestock of the Israelites not one died. Pharaoh inquired and found that not one of the livestock of the Israelites was dead. But the heart of Pharaoh was hardened, and he would not let the people go.