John Wesley on Exodus 3:5

Put off thy shoes from off thy feet - The putting off the shoe was then what the putting off the hat is now, a token of respect and submission. The ground is holy ground, made so by this special manifestation of the divine presence. We ought to approach to God with a solemn pause and preparation; and to express our inward reverence, by a grave and reverent behaviour in the worship of God, carefully avoiding every thing that looks light, or rude.