18 And it came to pass when the priests who bore the ark of the covenant of Jehovah had come up out of the midst of the Jordan, [when] the soles of the priests' feet were lifted up on to the dry land, that the waters of the Jordan returned to their place, and they flowed as previously, over all its banks.
Matthew Henry's Commentary on Joshua 4:18
Commentary on Joshua 4:10-19
(Read Joshua 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.