Nicene and Post-Nicene Fathers, Vol. IV:
Writings in Connection with the Donatist Controversy.: Chapter 7

Chapter 7.—10.  Zosimus also of Tharassa said:  "When a revelation of the truth has been made, error must give way to truth; for even Peter, who at the first circumcised, afterwards gave way to Paul when he declared the truth." 1275   He indeed chose to say error, not custom; but in saying "for even Peter, who at the first circumcised, afterwards gave way to Paul when he declared the truth," he shows plainly enough that there was a custom also on the subject of baptism at variance with his views.  At the same time, also, he warns us that it was not impossible that Cyprian might have held an opinion about baptism at variance with that required by the truth, as held by the Church both before and after him, if even Peter could hold a view at variance with the truth as taught us by the Apostle Paul. 1276

Footnotes

Ib. sec. 56.

Gal. ii. 11-14.