Cross reference
Joshua 3:12
12 Now therefore take you twelve men out of the tribes of Israel, out of every tribe a man.
Joshua 4:2
2 Take you twelve men out of the people, out of every tribe a man,
Joshua 4:4
4 Then Joshua called the twelve men, whom he had prepared of the children of Israel, out of every tribe a man:
Joshua 4:9
9 And Joshua set up twelve stones in the midst of Jordan, in the place where the feet of the priests which bare the ark of the covenant stood: and they are there unto this day.