Joshua 4:8
And the people of Israel did just as Joshua commanded and took up twelve stones out of the midst of the Jordan, according to the number of the tribes of the people of Israel, just as the LORD told Joshua. And they carried them over with them to the place where they lodged and laid them down there.
Joshua 1:16-18
And they answered Joshua, "All that you have commanded us we will do, and wherever you send us we will go.
Joshua 4:2-5
"Take twelve men from the people, from each tribe a man,
Joshua 4:20
And those twelve stones, which they took out of the Jordan, Joshua set up at Gilgal.