Nicene and Post-Nicene Fathers, Vol. IV:
Writings in Connection with the Donatist Controversy.: Chapter 16

Chapter 16.—26.  Nicomedes of Segermi 1641 said:  "My judgment is that heretics coming to the Church should be baptized, because they can obtain no remission of sins among sinners outside." 1642

27.  The answer to which is:  The judgment of the whole Catholic Church is that heretics, being already baptized with the baptism of Christ, although in heresy, should not be rebaptized on coming to the Church.  For if there is no remission of sins among sinners, neither can sinners within the Church remit sins; and yet those who have been baptized by them are not rebaptized.

Footnotes

Segermi church province of Byzacium.  A Nicomedes occurs in Cypr. Epp. lvii., lxvii., lxx.

Conc. Carth, sec. 9.