Joshua 4:5-7

5He said to them, “Go to the middle of the Jordan River in front of the ark of the Lord your God. Each man must take a stone on his shoulder, one for each tribe of Israel.

6This will be a sign for you. In the future your children will ask, ‘What do these stones mean to you?’

7You should answer, ‘The water of the Jordan River was cut off in front of the ark of the Lord’s promise. When the ark crossed the Jordan, the river stopped flowing. These stones are a permanent reminder for the people of Israel.’ ”