Halakhah for Yevamot 43:9

אמר רב נחמן גרים הואיל ואתו לידן נימא בהו מלתא אחין מן האם לא יעידו ואם העידו עדותן עדות אחין מן האב מעידין לכתחלה אמימר אמר אפילו אחין מן האם נמי מעידין לכתחלה

and stated: The question was raised in the West whether the second degrees of incest were forbidden as a preventive measure among proselytes or not'? — The other replied: Seeing that even in respect of actual incest, but for the fear that they might be said to have exchanged a [religion of] stricter for [one of] more easy-going sanctity, the Rabbis would not have imposed upon them any preventive measures,<span class="x" onmousemove="('comment',' Biblically, the proselyte is regarded as a newborn child and all his previous family ties are severed. It is only Rabbinically that he was subjected to the laws of incest. ');">²¹</span> is there any question [that they should have done so in respect of] the second degrees? Said R. Nahman: As the subject of proselytes has come up,<span class="x" onmousemove="('comment',' Lit., 'to our hand'. ');">²²</span>

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