Joshua 4:20
And those twelve stones which they had taken from the Jordan, Joshua set up in Gilgal.
Joshua 4:3
and command them, ‘Pick up for yourselves twelve stones [one each] from here out of the midst of the Jordan, from the place where the priests’ feet are standing firm; carry them over with you and lay them down at the place where you will spend the night tonight.’”
Joshua 4:8
So the [twelve men chosen from the] sons of Israel did as Joshua commanded, and took up twelve stones out of the midst of the Jordan, according to the number of the tribes of the sons of Israel, just as the Lord had spoken to Joshua; and they carried them over with them to the place where they were spending the night and put them down there.