Note 949 — Chapter III · THE ORDEAL OF RED-HOT IRON.
Reading edition
Guibert. Noviogent. de Incarnat. contra Judæos Lib. III. cap. xi. Guibert states that he had this from a Jew, who was an eye-witness of the fact.
Somewhat similar was a volunteer ordeal related by Gregory of Tours, when a Catholic disputing with an Arian threw his gold ring into the fire and when heated to redness placed it in his palm with an adjuration to God that if his faith was true it should not hurt him, which of course proved to be the case.—Greg. Turon. de Gloria Confess, c. xiv.