Joshua 5:13-15

13And it came to pass when Joshua was by Jericho, that he lifted up his eyes and looked, and behold, there stood a man before him with his sword drawn in his hand. And Joshua went to him, and said to him: Art thou for us, or for our enemies? 14And he said, No; for [as] captain of the army of Jehovah am I now come. Then Joshua fell upon his face to the earth, and worshipped, and said to him, What saith my lord unto his servant? 15And the captain of Jehovah's army said to Joshua, Loose thy sandal from off thy foot: for the place whereon thou standest is holy. And Joshua did so.