Related for Ketubot 50:8

תסתיים דר' העלה בן ע"פ אביו לכהונה דתניא הרי שבא ואמר בני זה וכהן הוא נאמן להאכילו בתרומה ואינו נאמן להשיאו אשה דברי רבי אמר לו ר' חייא אם אתה מאמינו להאכילו בתרומה תאמינו להשיאו אשה ואם אי אתה מאמינו להשיאו אשה לא תאמינו לאכול בתרומה

Conclude that it was Rabbi who raised the son to the priesthood on the testimony of his father, for it has been taught: If one comes and says: “This is my son and he is a priest,” he is believed with regard to allowing him to eat terumah, but he is not believed with regard to allowing him to marry a woman, the words of Rabbi. R. Hiyya said to him: If you believe him to allow him to eat terumah, believe him to allow him to marry a woman, and if you do not believe him so as to allow him to marry a woman, do not believe him also as to allow him to eat terumah.

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