Joshua 5:13-14

And then this, while Joshua was there near Jericho: He looked up and saw right in front of him a man standing, holding his drawn sword. Joshua stepped up to him and said, “Whose side are you on—ours or our enemies’?” He said, “Neither. I’m commander of GOD’s army. I’ve just arrived.” Joshua fell, face to the ground, and worshiped. He asked, “What orders does my Master have for his servant?”