Deuteronomy 7:2, 18
Deuteronomy 7:2 NIV
and when the LORD your God has delivered them over to you and you have defeated them, then you must destroy them totally. Make no treaty with them, and show them no mercy.
Deuteronomy 7:18 NIV
But do not be afraid of them; remember well what the LORD your God did to Pharaoh and to all Egypt.