Nicene and Post-Nicene Fathers, Vol. IV:
Writings in Connection with the Donatist Controversy.: Chapter 42

Chapter 42.—81.  Adelphius of Thasbalte 1743 said:  "It is surely without cause that they find fault with the truth in false and invidious terms, saying that we rebaptize, since the Church does not rebaptize heretics, but baptizes them." 1744

82.  Truly enough it does not rebaptize them, because it only baptizes those who were not baptized before; and this earlier custom has only been confirmed in a later Council by a more careful perfecting of the truth.

Footnotes

Thasbalte (Thasvalthe) was in ecclesiastical province of Byzacene.  An Adelphius is mentioned in Cypr. Ep. lxvii.

Conc. Carth. sec. 35.