Joshua 4:2-3

²Choose thou twelve men, by each lineage one man, (Choose thou twelve men, one man out of each tribe,)

³and command thou to them, that they take from the midst of the trough of (the) Jordan, where the feet of the priests stood, twelve hardest stones; the which thou shalt set in the place of the tents, where ye shall set (the) tents in this night. (and command thou to them, that they take out of the middle of the trough, or the riverbed, of the Jordan River, twelve stones, from where the feet of the priests had firmly stood; which thou shalt put in the place of the camp, where ye shall pitch the tents tonight.)