And Pharaoh sent, and, behold, there was not one of the cattle of the Israelites dead. And the heart of Pharaoh was hardened, and he did not let the people go. And Pharaoh sent, etc. - Finding so many of his own cattle and those of his subjects slain, he sent to see whether the mortality had reached to the cattle of the Israelites, that he might know whether this were a judgment inflicted by their God, and probably designing to replace the lost cattle of the Egyptians with those of the Israelites.
Related Commentaries of Exodus 9:7
Exodus 9:7
7 And Pharaoh sent, and, behold, there was not one of the cattle of the Israelites dead. And the heart of Pharaoh was hardened, and he did not let the people go.