Jos 4:3
4:3 And command ye them, saying, Take you hence out of the midst
    of Jordan, out of the place where the priests' feet stood
    {a} firm, twelve stones, and ye shall carry them over with
    you, and leave them in the {b} lodging place, where ye shall
    lodge this night.

    (a) As in Jos 3:17.
    (b) Meaning, the place where they would camp.

Jos 4:6
4:6 That this may be a sign among you, [that] when your {c}
    children ask [their fathers] in time to come, saying, What
    [mean] ye by these stones?

    (c) God commands that not only we ourselves profit by this
        wonderful work, but that our posterity may know the
        cause of it, and glorify his Name.

Jos 4:9
4:9 And Joshua set up {d} twelve stones in the midst of Jordan,
    in the place where the feet of the priests which bare the
    ark of the covenant stood: and they are there unto this day.

    (d) Besides the twelve stones that were carried by the
        tribes and set up in Gilgal.

Jos 4:11
4:11 And it came to pass, when all the people were clean passed
     over, that the ark of the LORD passed over, and the
     priests, {e} in the presence of the people.

     (e) Meaning, in the presence or sight of the people.

Jos 4:13
4:13 About forty thousand prepared for war passed over before
     the {f} LORD unto battle, to the plains of Jericho.

     (f) That is, before the Ark.

Jos 4:16
4:16 Command the priests that bear the {g} ark of the testimony,
     that they come up out of Jordan.

     (g) Because the ark testified God's presence, and the
         tables of the Law contained in it signified God's will
         toward his people.

Jos 4:19
4:19 And the people came up out of Jordan on the tenth [day] of
     the {h} first month, and encamped in Gilgal, in the east
     border of Jericho.

     (h) Called Abib or Nisan, containing part of March and part
         of April.

Jos 4:24
4:24 That all the people of the {i} earth might know the hand of
     the LORD, that it [is] mighty: that ye might fear the LORD
     your God for ever.

     (i) God's benefits serve as a further condemnation to the
         wicked, and stir up his own to reverence and obey him.