Joshua 4:5-7

Amplified Bible

⁵ and Joshua said to them, “Cross over again to the ark of the Lord your God into the midst of the Jordan, and each of you take up a stone on his shoulder, according to the number of the tribes of the sons of Israel, ⁶ so that this may be a sign among you; when your children ask later, ‘What do these stones mean to you?’ ⁷ then you shall say to them that the waters of the Jordan were cut off before the ark of the covenant of the Lord; when it crossed the Jordan, the waters of the Jordan were cut off. So these stones shall become a memorial for Israel forever.”