Numbers 22:20-24

And God came to Balaam at night and said to him, “If the men have come to call you, rise and go with them; but you shall do only the thing that I tell you.”

So Balaam arose in the morning, saddled his donkey, and went with the leaders of Moab. The Angel and Balaam

But God was angry that he was going, and the angel of the Lord took his stand in the road as an adversary against him. Now he was riding on his donkey, and his two servants were with him.

When the donkey saw the angel of the Lord standing in the road with his sword drawn in his hand, the donkey turned off from the road and went into the field; and Balaam struck the donkey to guide her back onto the road.

Then the angel of the Lord stood in a narrow path of the vineyards, with a stone wall on this side and on that side.