Exodus 14:5-7

5When the king of Egypt was told that the people had fled, Pharaoh and his officials changed their minds about them and said, “What have we done? We have let the Israelites go and have lost their services!” 6So he had his chariot made ready and took his army with him. 7He took six hundred of the best chariots, along with all the other chariots of Egypt, with officers over all of them.