Nicene and Post-Nicene Fathers: Series I/Volume IV/Donatist Controversy/On Baptism/Book VII/Chapter 28
Chapter 28.—54. Another Saturninus of Abitini[1] said: "If Antichrist can give to any one the grace of Christ, then can heretics also baptize, who are called Antichrists."[2]
55. What if another were to say, If a murderer can give the grace of Christ, then can they also baptize that hate their brethren who are called murderers? For certainly he would seem in a way to speak the truth, and yet they can baptize; in like manner, therefore, can the heretics as well.