Ante-Nicene Fathers/Volume V/Cyprian/The Treatises of Cyprian/Three Books of Testimonies Against the Jews/Book III/Part 25
25. That unless a man have been baptized and born again, he cannot attain unto the kingdom of God.
In the Gospel according to John: “Except a man be born again of water and the Spirit, he cannot enter into the kingdom of God. For that which is born of the flesh is flesh; and that which is born of the Spirit is spirit.”[1] Also in the same place: “Unless ye eat the flesh of the Son of man, and drink His blood, ye shall not have life in you.”[2]