For when the time of the passion of the Lifegiver of all was arrived, He ate the legal passover with His disciples. He took bread and blessed and brake and gave to His disciples, and said, This is My Body in truth, without doubt. And he took the cup and gave thanks and blessed and gave to His apostle’s, and said, This is My true Blood which is for you. And He commanded them to receive and drink of it, all of them, that it might be making atonement for their debts for ever.
-St. Narsai Harp of the Spirit