Joshua 6:3 - Joseph Benson’s Commentary on the Old and New Testaments

Round about the city once At a convenient distance, out of the reach of their arrows. Six days Every day once. This and the following course might seem ridiculous and absurd, and is therefore prescribed by God, that they might learn to take new measures of things, and to expect success, not from their own valour, or skill, but merely from God's appointment and blessing; and in general, not to judge of any of God's institutions by mere carnal reason, to which divers of their ceremonies would seem no less foolish than this action.