Numbers 22:21-25

²¹And Balaam rose in the morning, and saddled his ass, and went with the princes of Moab.

²²And God's anger was kindled because he went: and the angel of the LORD stood in the way for an adversary against him. Now he was riding upon his ass, and his two servants were with him.

²³And the ass saw the angel of the LORD standing in the way, and his sword drawn in his hand: and the ass turned aside out of the way, and went into the field: and Balaam smote the ass, to turn her into the way.

²⁴But the angel of the LORD stood in a path of the vineyards, a wall being on this side, and a wall on that side.

²⁵And when the ass saw the angel of the LORD, she thrust herself against the wall, and crushed Balaam's foot against the wall: and he smote her again.