Exodus 3:5
And he said, Draw not near here: put off your shoes from off your feet, for the place where on you stand is holy ground.
Torrey's Topical Textbook—AKJV

Joshua 5:15
And the captain of the LORD's host said to Joshua, Loose your shoe from off your foot; for the place where on you stand is holy. And Joshua did so.
Torrey's Topical Textbook—AKJV