IV. That the priests stood still in the midst of Jordan while all the people passed over, v. 17. There the ark was appointed to be, to show that the same power that parted the waters kept them parted as long as there was occasion; and had not the divine presence, of which the ark was a token, been their security, the waters would have returned upon them and buried them. There the priests were appointed to stand still, 1. To try their faith, whether they could venture to take their post, when god assigned it to them, with mountains of water over their heads. As they made a bold step when they set the first foot into Jordan, so now they made a bold stand when they tarried longest in Jordan; but they knew they carried their own protection with them. Note, Ministers in times of peril should be examples of courage and confidence in the divine goodness. 2. It was to encourage the faith of the people, that they might go triumphantly into Canaan, and fear no evil, no, not in this valley of the shadow of death (for so the divided river was), being assured of God's presence, which interposed between them and the greatest danger, between them and the proud waters, which otherwise had gone over their souls. Thus in the greatest dangers the saints are comforted with his rod and his staff, Ps. xxiii. 4.