Exodus 9:4-6

But the LORD will again make a distinction between the livestock of the Israelites and that of the Egyptians. Not a single one of Israel’s animals will die! The LORD has already set the time for the plague to begin. He has declared that he will strike the land tomorrow.’” And the LORD did just as he had said. The next morning all the livestock of the Egyptians died, but the Israelites didn’t lose a single animal.