Commentaries
4:10-19 The priests with the ark did not stir till ordered to move. Let none be weary of waiting, while they have the tokens of God's presence with them, even the ark of the covenant, though it be in the depths of adversity. Notice is taken of the honour put upon Joshua. Those are feared in the best manner, and to the best purpose, who make it appear that God is with them, and that they set him before them.
18. it came to pass, when the priests that bare the ark … were come out of the midst of Jordan … that the waters of Jordan returned unto their place—Their crossing, which was the final act, completed the evidence of the miracle; for then, and not till then, the suspended laws of nature were restored, the waters returned to their place, and the river flowed with as full a current as before.