Observance With regard to the question of frequency, the New Testament does not specify how often a congregation should observe the Lord’s Supper. Paul states that Jesus simply said: “Do this, whenever you drink it, in remembrance of me” (1 Cor. 11:25). In the Middle Ages, Rome made the Mass obligatory for people only annually. Zwingli called for a quarterly observance (Easter, Pentecost, autumn, and Christmas), while Calvin advocated at least a weekly observance but reluctantly settled for less.