Joshua 5:14-15

14And he said, “No; but I am the commander of the army of the Lord. Now I have come.” And Joshua afell on his face to the earth and worshiped and said to him, “What does my lord say to his servant?” 15And the commander of the Lord’s army said to Joshua, b“Take off your sandals from your feet, for the place where you are standing is holy.” And Joshua did so.

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