Exodus 23:21 in the World English Bible
Pay attention to him, and listen to his voice. Don’t provoke him, for he will not pardon your disobedience, for my name is in him.
Context
20 Behold, I send an Angel before thee, to keep thee in the way, and to bring thee into the place which I have prepared.
21 Beware of him, and obey his voice, provoke him not; for he will not pardon your transgressions: for my name is in him.
22 But if thou shalt indeed obey his voice, and do all that I speak; then I will be an enemy unto thine enemies, and an adversary unto thine adversaries.