Numbers 22:31 in the King James Version
Then the LORD opened the eyes of Balaam, and he saw the angel of the LORD standing in the way, and his sword drawn in his hand: and he bowed down his head, and fell flat on his face.
Context
30 The donkey said to Balaam, “Am I not your donkey, on which you have ridden all your life long until today? Was I ever in the habit of doing so to you?” He said, “No.”
31 Then the LORD opened the eyes of Balaam, and he saw the LORD’s angel standing in the way, with his sword drawn in his hand; and he bowed his head, and fell on his face.
32 The LORD’s angel said to him, “Why have you struck your donkey these three times? Behold, I have come out as an adversary, because your way is perverse before me.