Exodus 23:20-22

“I am sending an angel ahead of you, who will protect you as you travel. He will lead you to the place I have prepared. Pay attention to the angel and obey him. Do not turn against him; he will not forgive such turning against him because my power is in him. If you listen carefully to all he says and do everything that I tell you, I will be an enemy to your enemies. I will fight all who fight against you.