Joshua 4:19-22

On the tenth day of the first month the people went up from the Jordan and camped at Gilgal on the eastern border of Jericho. And Joshua set up at Gilgal the twelve stones they had taken out of the Jordan. He said to the Israelites, “In the future when your descendants ask their parents, ‘What do these stones mean?’ tell them, ‘Israel crossed the Jordan on dry ground.’