NPNF1-04. Augustine: The Writings Against the Manichaeans and Against the Donatists

Chapter 42.—81. Adelphius of ThasbalteEp. lxvii.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

1. 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.