Joshua 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 firm, twelve stones, and ye shall carry them over with you, and leave them in the lodging place, where ye shall lodge this night.
Cross-reference
Joshua 4:8 records the exact obedience to this command — the stones are taken as instructed.
Joshua 3:13 describes the waters being cut off at the priests' feet — the exact place from which these stones are taken as a memorial.
Joshua 3:17 describes priests standing in the Jordan — the exact spot from which these stones are taken.
Joshua 24:26 records another memorial stone set up by Joshua — similar function to the twelve stones here.
Joshua 24:27 sets up a stone as a witness, similarly using stones to memorialize God's covenant acts.
Exodus 24:4 has twelve pillars for the tribes — a parallel memorial structure to the twelve stones here.
1 Kings 18:31 also uses twelve stones for the tribes — echoing the memorial stones here.
Deuteronomy 27 commands setting up stones with the law after crossing the Jordan, linking to the memorial stones taken from the riverbed.