And he hardened Pharaoh’s heart, that he hearkened not unto them; as the LORD had said.
A description of Pharaoh's response to Moses and Aaron.
Exodus 7:13
King James Version (public domain)
Traditionally attributed to Moses · c. 13th century BC · The Pentateuch — Genesis, Exodus, Leviticus, Numbers, and Deuteronomy — is traditionally attributed to him
Context
11Then Pharaoh also called the wise men and the sorcerers: now the magicians of Egypt, they also did in like manner with their enchantments.
12For they cast down every man his rod, and they became serpents: but Aaron’s rod swallowed up their rods.
13And he hardened Pharaoh’s heart, that he hearkened not unto them; as the LORD had said.
14And the LORD said unto Moses, Pharaoh’s heart is hardened, he refuseth to let the people go.
15Get thee unto Pharaoh in the morning; lo, he goeth out unto the water; and thou shalt stand by the river’s brink against he come; and the rod which was turned to a serpent shalt thou take in thine hand.