The Church History of Eusebius 185Cyprian, and the Bishops with him, first taught that it was necessary to purify by Baptism those converted from Heresy.

Eusebius of Caesarea · The Nicene and Post-Nicene Fathers Series II Volume I: Eusebius Pamphilius: Church History, Life of Constantine, Oration in Praise of Constantine by Philip Schaff

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First of all, Cyprian, pastor of the parish of Carthage, maintained that they should not be received except they had been purified from their error by baptism. But Stephen considering it unnecessary to add any innovation contrary to the tradition which had been held from the beginning, was very indignant at this.