Exodus 7:23

And Pharaoh turned, and went into his house
Turned away from Moses and Aaron, and turned back from the river to which he came, and went to his palace in the city; it being perhaps now about dinner time, when all before related had passed:

neither did he set his heart to this also:
had no regard to this miracle of turning the waters into blood, as well as he had none to the rod being turned into a serpent, and devouring the rods of the magicians; he neither considered the one nor the other, or seriously and closely thought of this, any more than of the other.