Charles Buck Theological Dictionary
Baptism of the Dead
A custom which anciently prevailed among some people in Africa, of giving baptism to the dead. The third council of Carthage speaks of it as a thing that ignorant Christians were fond of : Gregory Nazianzin also takes notice of the same superstitious opinion. The practice seems to be grounded on a vain idea, that, when men had neglected to receive baptism in their life-time, some compensation might be made for this default by receiving it after death.
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Buck, Charles. Entry for 'Baptism of the Dead'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/b/baptism-of-the-dead.html. 1802.