Nicene and Post-Nicene Fathers, Vol. IV:
Writings in Connection with the Donatist Controversy.: Chapter 22

Chapter 22.—42.  Faustus of Timida Regia 1820 said:  "Let not these persons flatter themselves who favor heretics.  He who interferes with the baptism of the Church on behalf of heretics makes them Christians, and us heretics." 1821

43.  To him we answer:  If any one were to say that a man who, when he received baptism had not received remission of his sins, because he entertained hatred towards his brother in his heart, was nevertheless not to be baptized again when he dismissed that hatred from his heart, does such a man interfere with the baptism of the Church on behalf of murderers, or does he make them righteous and us murderers?  Let him therefore understand the same also in the case of heretics.

Footnotes

Timida Regia was in ecclesiastical province of Zeugitana.  A Faustus is mentioned in Cypr. Ep. lxvii.

Conc. Carth. sec. 58.