Deuteronomy 7:17-21

17If thou shalt say in thine heart, These nations are more than I; how can I dispossess them?

18Thou shalt not be afraid of them: but shalt well remember what the Lord thy God did unto Pharaoh, and unto all Egypt;

19The great temptations which thine eyes saw, and the signs, and the wonders, and the mighty hand, and the stretched out arm, whereby the Lord thy God brought thee out: so shall the Lord thy God do unto all the people of whom thou art afraid.

20Moreover the Lord thy God will send the hornet among them, until they that are left, and hide themselves from thee, be destroyed.

21Thou shalt not be affrighted at them: for the Lord thy God is among you, a mighty God and terrible.