Exodus 23:20-22

“Behold, I send an angel before you to guard you on the way and to bring you to the place that I have prepared. Pay careful attention to him and obey his voice; do not rebel against him, for he will not pardon your transgression, for my name is in him. “But if you carefully obey his voice and do all that I say, then I will be an enemy to your enemies and an adversary to your adversaries.