Exodus 23:20-23

Behold, I send an angel before thee, to keep thee by the way, and to bring thee into the place which I have prepared. Take ye heed before him, and hearken unto his voice; provoke him not; for he will not pardon your transgression: for my name is in him. But if thou shalt indeed hearken unto his voice, and do all that I speak; then I will be an enemy unto thine enemies, and an adversary unto thine adversaries. For mine angel shall go before thee, and bring thee in unto the Amorite, and the Hittite, and the Perizzite, and the Canaanite, the Hivite, and the Jebusite: and I will cut them off.