Exodus 23:21 KJV
Beware of him, and obey his voice, provoke him not; for he will not pardon your transgressions: for my name is in him.
Exodus 23:19–23 KJV Chapter Context
19
The first of the firstfruits of thy land thou shalt bring into the house of the LORD thy God. Thou shalt not seethe a kid in his mother’s milk.
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.
23
For mine Angel shall go before thee, and bring thee in unto the Amorites, and the Hittites, and the Perizzites, and the Canaanites, the Hivites, and the Jebusites: and I will cut them off.