For the source text click/tap here: Shavuot 33
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According to the Mishna on our daf the halakhot of shevuat ha-eidut – the laws governing cases where a person refuses to offer testimony, swearing that he does not have information that would be useful in court – only apply to monetary cases. Thus, were someone to swear that he had no information about whether someone was a kohen or a levi, even if he was lying, the laws of shevuat ha-eidut would not apply.
A new Mishnah states "“I adjure you that you come and bear testimony for me that I am a Kohen, or, that I am a Levi, or, that I am not the son of a divorced woman, or, that I am not the son of a chalutzah; that so-and-so is a Kohen, or, that so-and-so is a Levi, or, that he is not the son of a divorced woman, or, that he is not the son of a chalutzah; that so-and-so violated another's daughter, or seduced his daughter; that my son injured me; that my neighbor injured me, or set fire to my haystack on Shabbos,” — they are exempt “
We explore marital rape in talmud and scholarship.