While all this was going on, Balaam still did not perceive that God's angel stood before him. God meant to show him that in His hand is not only the tongue of man, but his eye as well, so that as long as He chooses, man will fail to see what is directly before his nose. But God suddenly permitted Balaam to see the angel with a sword drawn in his hand, and Balaam fell flat on his face. For, being uncircumcised, Balaam might not listen to the words of God or of an angel, standing erect; hence, upon perceiving the angel, who instantly began to address him, Balaam cast himself upon the ground.
The sword in the angel's hand did not signify that he meant to strike Balaam, for a breath from his mouth would have sufficed to kill myriads, but it was to point out the following truth to Balaam: "The mouth was given to Jacob, but to Esau and to the other nations, the sword. Thou are about to change thy profession, and to go out against Israel with his own weapon, and therefore shalt thou find death through the sword that is thy own weapon."