Deuteronomy 7:15-23

And Jehovah will take away from thee all sickness; and none of the evil diseases of Egypt, which thou knowest, will he put upon thee, but will lay them upon all them that hate thee. And thou shalt consume all the peoples that Jehovah thy God shall deliver unto thee; thine eye shall not pity them: neither shalt thou serve their gods; for that will be a snare unto thee. If thou shalt say in thy heart, These nations are more than I; how can I dispossess them? thou shalt not be afraid of them: thou shalt well remember what Jehovah thy God did unto Pharaoh, and unto all Egypt; the great trials which thine eyes saw, and the signs, and the wonders, and the mighty hand, and the outstretched arm, whereby Jehovah thy God brought thee out: so shall Jehovah thy God do unto all the peoples of whom thou art afraid. Moreover Jehovah thy God will send the hornet among them, until they that are left, and hide themselves, perish from before thee. Thou shalt not be affrighted at them; for Jehovah thy God is in the midst of thee, a great God and a terrible. And Jehovah thy God will cast out those nations before thee by little and little: thou mayest not consume them at once, lest the beasts of the field increase upon thee. But Jehovah thy God will deliver them up before thee, and will discomfit them with a great discomfiture, until they be destroyed.