Matthew Henry on Joshua 4:20–end
The twelve stones which were laid down in Gilgal (Jos 4:8) are here set up either one upon another, yet so as that they might be distinctly counted, or one by another in rows; for after they were fixed they ar not call a heap of stones, but these stones.
I. It is here taken for granted that posterity would enquire into the meaning of them, supposing them intended for a memorial: Your children shall ask their fathers (for who else should they ask?) What mean these stones? Notes, Those that will be wise when they are old must be inquisitive when they are young. Our Lord Jesus, though he had in himself the fulness of knowledge, has by his example taught children and young people to hear and ask…
Read the whole note in the consoleJamieson-Fausset-Brown on Joshua 4:20
those twelve stones, which they took out of Jordan, did Joshua pitch in Gilgal--Probably to render them more conspicuous, they might be raised on a foundation of earth or turf. The pile was designed to serve a double purpose--that of impressing the heathen with a sense of the omnipotence of God, while at the same time it would teach an important lesson in religion to the young and rising Israelites in after ages.
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Adam Clarke on Joshua 4:20
Those twelve stones - It is very likely that a base of mason-work was erected of some considerable height, and then the twelve stones placed on the top of it; and that this was the case both in Jordan and in Gilgal: for twelve such stones as a man could carry a considerable way on his shoulder, see Jos 4:5, could scarcely have made any observable altar, or pillar of memorial: but erected on a high base of mason-work they would be very conspicuous, and thus properly answer the end for which God ordered them to be set up.
John Gill on Joshua 4:20
And those twelve stones which they took out of Jordan,.... The twelve men who were sent there for that purpose, and took them from thence, and brought them hither, Joshua 4:3,
did Joshua pitch in Gilgal; set them in rows, or one upon another, and made a pillar of them commemorative of their passage over Jordan into the land of Canaan: according to Josephus (n), he made an altar of these stones; and Ben Gersom is of opinion, that they were placed in the sanctuary by the ark, though not in it; which yet was the sentiment of Tertullian (o), but very improbable; since that ark was not capable of such a number of large stones; and it must be a very large ark or chest, if one could be supposed to…