Joshua 4:6

That this may be a sign unto you. There was for many years a visible memorial of the miracle. When your children ask their fathers in time to come (cf. Exodus 12:26 ; Exodus 13:14 ; Deuteronomy 6:20 ). The passover, the law itself, as well as certain outward and visible memorials, were to be the guarantees to future ages of the truth of the history related in the Books of Hoses and Joshua. The monument has disappeared, but the observance of the passover and the whole law by the Jews now, more than 3,000 years after the events related in these books, is a perpetual standing witness of the truth of the record. In like manner the Christian passover, the sacrament of the Lord's Supper, is appealed to by Christians of every denomination as a proof of the substantial truth of the narrative of the Gospels.