Quoting%20commentary for Sanhedrin 115:2
הא כיצד נשא אחותו מן האם יוציא מן האב יקיים אחות האב מן האם יוציא מן האב יקיים
possesses kin on his mother's side but not on his father's side. E.g., if he married his sister by his mother, [born before his mother's conversion, and who subsequently became converted too,] he must divorce her; by his father, he may keep her; his father's sister by his father's mother, he must divorce her; by his father's father, he may keep her; his mother's sister by her mother, he must renounce her; by her father — R. Meir ruled that he must divorce her, but the Sages maintained that he may keep her; for R. Meir held that all forbidden degrees of consanguinity on the mother's side must be divorced; on the father's side may be kept.<span class="x" onmousemove="('comment',' The guiding principal in all this is: 'a proselyte is as a new born babe', who stands absolutely in no relationship to any pre-conversion relation. Consequently, his brothers and sisters, father, mother, etc. from before his conversion lose his relationship on his conversion. Should they too subsequently become converted, they are regarded as strangers to him, and he might marry, e.g., his mother or sister. This is the Biblical law. But since heathens themselves recognised the law of incest in respect of maternal relations, the Rabbis decreed that this should hold good for a proselyte too, i.e., that he is forbidden to marry his maternal relations who were forbidden to him before his conversion, so that it should not be said that he abandoned a faith with a higher degree of sanctity than the one he has embraced (since he cannot be expected to understand the principle of complete annulment of relationships). In this case, since he was born in sanctity, he is really not a proselyte at all. He is so styled because he too is legally a stranger to all his father's and mother's pre-conversion relations. As for his mother's paternal sister, R. Meir held that since she is partly maternally related, she is forbidden, as otherwise it would be thought that a proselyte is permitted to marry his maternal relations. But the Rabbis held that there was no fear of this, and since the relationship is in its source paternal, it is not forbidden. ');"><sup>2</sup></span>
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