Commentaries:
Jamieson, Fausset, and Brown
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.
Other Jamieson, Fausset, and Brown entries containing Joshua 4:21:
Joshua 4:14-17
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