Exodus 9:7

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.

Pharaoh sent, and, behold, there was not one ... The despatch of confidential messengers indicates that he would not give credit to vague reports; and we may conclude that some impression had been made on his mind by that extraordinary exemption, but it was neither a good nor a permanent impression. His pride and obstinacy were in no degree subdued.