Numbers 22:22-23

22Then God’s anger was aroused because he went, and the Angel of the Lord took His stand in the way as an adversary against him. And he was riding on his donkey, and his two servants were with him.

23Now the donkey saw the Angel of the Lord standing in the way with His drawn sword in His hand, and the donkey turned aside out of the way and went into the field. So Balaam struck the donkey to turn her back onto the road.