5. He directs them to get twelve men ready, one of each tribe, who must be within call to receive such orders as Joshua should afterwards give them, v. 12. It does not appear that they were to attend the priests, and walk with them when they carried the ark, that they might more immediately be witnesses of the wonders done by it, as some think; but they were to be at hand for the service they were called to, ch. iv. 4, &c.