Then Joshua called the twelve men, whom he had prepared of the children of Israel, out of every tribe a man: / And Joshua said unto them, Pass over before the ark of the LORD your God into the midst of Jordan, and take you up every man of you a stone upon his shoulder, according unto the number of the tribes of the children of Israel: / That this may be a sign among you, that when your children ask their fathers in time to come, saying, What mean ye by these stones? / Then ye shall answer them, That the waters of Jordan were cut off before the ark of the covenant of the LORD; when it passed over Jordan, the waters of Jordan were cut off: and these stones shall be for a memorial unto the children of Israel for ever. Bible