Numbers 22:22-23

²²But God's anger was kindled because he went, and the angel of the Lord took his stand in the way as his adversary. Now he was riding on the donkey, and his two servants were with him.

²³And the donkey saw the angel of the Lord standing in the road, with a drawn sword in his hand. And the donkey turned aside out of the road and went into the field. And Balaam struck the donkey, to turn her into the road.