When the king of Egypt was told that the people had fled,1 Pharaoh and his officials changed their minds2 about them and said, "What have we done? We have let the Israelites go and have lost their services!"
References for Exodus 14:5
So he had his chariot made ready and took his army with him.
He took six hundred of the best chariots,3 along with all the other chariots of Egypt, with officers over all of them.
References for Exodus 14:7
The LORD hardened the heart4 of Pharaoh king of Egypt, so that he pursued the Israelites, who were marching out boldly.5
References for Exodus 14:8
The Egyptians--all Pharaoh's horses6 and chariots, horsemen and troops7--pursued the Israelites and overtook8 them as they camped by the sea near Pi Hahiroth, opposite Baal Zephon.9
References for Exodus 14:9