Quoting%20commentary for Sanhedrin 107:2
(ויקרא כ, יא) אשר ישכב את אשת אביו משמע בין אשת אביו שהיא אמו ובין אשת אביו שלא אמו אמו שאינה אשת אביו מניין ת"ל (ויקרא כ, יא) ערות אביו גלה מופנה להקיש ולדון ממנו גזרה שוה
The man excludes a minor;that lieth with his father's wife, implies whether she is his mother or not.Whence do I know that his mother who is not his father's wife [is also thusforbidden]? — From the verse, [he] hath uncovered his father's nakedness.For this is redundant,<span class="x" onmousemove="('comment',' In a gezerah shawah, the word used as a basis of deduction must be otherwise redundant ([H]), being required for no other purpose. This is the opinion of R. Ishmael and R. Eliezer; the former deeming it sufficient if the redundancy is in one of the passages only, the latter insisting that the word must be superfluous in both. R. Akiba, however, maintained that such redundancy, even in one passage, is unnecessary. ');"><sup>2</sup></span>
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