Numbers 22:20-22

And God came unto Balaam at night, and said unto him, If the men are come to call thee, rise up, go with them; but only the word which I speak unto thee, that shalt thou do. And Balaam rose up in the morning, and saddled his ass, and went with the princes of Moab. And God’s anger was kindled because he went; and the angel of Jehovah placed himself in the way for an adversary against him. Now he was riding upon his ass, and his two servants were with him.