Joshua 4:8

4:8 The Israelites did just as Joshua commanded. They picked up twelve stones, according to the number of the Israelite tribes, from the middle of the Jordan as the Lord had instructed Joshua. They carried them over with them to the camp and put them there.

Joshua 4:19-20

4:19 The people went up from the Jordan on the tenth day of the first month and camped in Gilgal on the eastern border of Jericho. 4:20 Now Joshua set up in Gilgal the twelve stones they had taken from the Jordan.