Exodus 23:20-22

“See, I am sending an angel ahead of you to guard you along the way and to bring you to the place I have prepared. Pay attention to him and listen to what he says. Do not rebel against him; he will not forgive your rebellion, since my Name is in him. If you listen carefully to what he says and do all that I say, I will be an enemy to your enemies and will oppose those who oppose you.