2. And it came to pass after three days, etc That is, three days after their departure had been intimated. For they did not halt at the bank longer than one night. But as the period of three days had previously been fixed for crossing, and they had no hope of being able to accomplish it, Joshua now exhorts them to pay no more regard to obstacles and difficulties, and to attend to the power of God. For although the form of the miracle is not yet explained, yet when the ark of the covenant is brought forward like a banner to guide the way, it was natural to infer that the Lord was preparing something unusual. And while they are kept in suspense, their faith is again proved by a serious trial; for it was an example of rare virtue to give implicit obedience to the command, and thus follow the ark, while they were obviously uninformed as to the result. This, indeed, is the special characteristic of faith, not to inquire curiously what the Lord is to do, nor to dispute subtlety as to how that which he declares can possibly be done, but to cast all our anxious cares upon his providence, and knowing that his power, on which we may rest, is boundless, to raise our thoughts above the world, and embrace by faith that which we cannot comprehend by reason.