Deuteronomy 11:4

11:4 or what he did to the army of Egypt, including their horses and chariots, when he made the waters of the Red Sea overwhelm them while they were pursuing you and he annihilated them.

Deuteronomy 17:16

17:16 Moreover, he must not accumulate horses for himself or allow the people to return to Egypt to do so, for the Lord has said you must never again return that way.