Charles Buck Theological Dictionary
A sect of heretics, in 1534, who scraped their forehead with a knife till it bled, and then poured oil into the wound. This ceremony served them instead of baptism. They are likewise said to have denied the divinity of the Holy Spirit.
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Buck, Charles. Entry for 'Effrontes'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/e/effrontes.html. 1802.