Sinners may do penance for a set time, and according to the rules of discipline come to public confession, and by imposition of the hand of the bishop and clergy receive the right of Communion. [But now some] with their time [of penance] still unfulfilled . . . they are admitted to Communion, and their name is presented; and while the penitence is not yet performed, confession is not yet made, the hands of the bishop and clergy are not yet laid upon them, the Eucharist is given to them; although it is written, “Whosoever shall eat the bread and drink the cup of the Lord unworthily, shall be guilty of the body and blood of the Lord” [1 Cor 11:27]. – Letters 9:2 (250 A.D.)

St. Cyprian of Carthage