Shulchan Arukh, Even HaEzer Siman 19
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מי שהוחזק בשאר בשר דנין על פי חזקה זו אע"פ שאין שם ראיה ברורה שזה קרוב ומלקין וחונקין וסוקלין על חזקה זו:
One who is held to be a kinsman [in regards to illicit relations], we judge on this presumption in spite of the fact that there is no clear proof that he is a relative, and we lash [him] and strangle [him] and stone [him] according to this presumption.
איש ואשה שבאו ממדינת הים היא אומרת זה בעלי והוא אומר זו אשתי אם הוחזקו בעיר ל' יום שהיא אשתו הורגין עליה:
A man and a woman that came from a foreign country, she says: this is my husband, and he says: this is my wife, if it becomes known in that city for thirty days that she is his wife, they kill because of her.