Exodus 9:4-6 NIV

4 But the LORD will make a distinction between the livestock of Israel and that of Egypt,1 so that no animal belonging to the Israelites will die.' "

References for Exodus 9:4

5 The LORD set a time and said, "Tomorrow the LORD will do this in the land."
6 And the next day the LORD did it: All the livestock2 of the Egyptians died,3 but not one animal belonging to the Israelites died.

References for Exodus 9:6