Joshua 5:13-15

One day, Joshua was near Jericho when he saw a man standing some distance in front of him. The man was holding a sword, so Joshua walked up to him and asked, “Are you on our side or on our enemies' side?” “Neither,” he answered. “I am here because I am the commander of the LORD's army.” Joshua fell to his knees and bowed down to the ground. “I am your servant,” he said. “Tell me what to do.” “Take off your sandals,” the commander answered. “This is a holy place.” So Joshua took off his sandals.