Then the LORD opened Balaam's eyes, and he saw the Angel of the LORD standing in the way with His drawn sword in His hand; and he bowed his head and fell flat on his face.
Numbers 22:31
Surrounding context
22:30 So the donkey said to Balaam, "Am I not your donkey on which you have ridden, ever since I became yours, to this day? Was I ever disposed to do this to you?" And he said, "No."
22:31 Then the LORD opened Balaam's eyes, and he saw the Angel of the LORD standing in the way with His drawn sword in His hand; and he bowed his head and fell flat on his face.
22:32 And the Angel of the LORD said to him, "Why have you struck your donkey these three times? Behold, I have come out to stand against you, because your way is perverse before Me.