אלא פריך הכי מה לנדה ואשת אח שכן אין אוסרן מתירן תאמר באשת איש שאוסרה מתירה
since the man who caused them to be forbidden cannot cause them to be permitted.<span class="x" onmousemove="('comment',' The former is dependent on the prescribed number of days and the latter on the absence of any issue. And thus the original question remains: Whence is deduced the prohibition of the first stage of contact in the ease of all forbidden unions?
');"><sup>4</sup></span> Would you [then] apply their restrictions to a married woman whose permissibility is brought about<span class="x" onmousemove="('comment',' Through divorce.
');"><sup>5</sup></span> by the man who caused her to be forbidden? But, said R. Johanan, or as some say, R. Huna son of R. Joshua, Scripture stated, For whosoever shall do any of these abominations, even the souls that do them shall be cut off,<span class="x" onmousemove="('comment',' Lev. XVIII, 29.
');"><sup>6</sup></span>
Sefer HaChinukh
From the laws of the commandment is, for example, that which they, may their memory be blessed, said (Yevamot 54b) that the prohibition of the sister of the father is whether she is the sister of his father from the father only or from the mother only; whether she is the sister from marriage or whether from licentiousness - as each one of these is called his sister regardless. And there is no room for secondary [prohibitions] here.
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Sefer HaChinukh
From the laws of the commandment is that which they, may their memory be blessed, said (Yevamot 54b) that she is called the sister of his wife, whether she is the sister from her mother or the sister from her father; whether from marriage or whether from licentiousness. And they also explained that the prohibition comes into force from when he designates her, and as the expression of taking of a woman is always understood by us, as we said. And also that which they, may their memory be blessed, forbade the sister of his bound one, as a fence for this prohibition. And the understanding of his bound one is such a case as one who has a brother and he dies and does not leave children, such that he is obligated by the Torah to marry his wife or to release her, as it appears explicitly in the written commandment (Sefer HaChinukh 597, 599). And that is the woman that is bound to the brother, meaning to say that she is in the domain of the brother to marry her if he wants. Since she is acquired by him from the Heavens, she is called, "his bound one." And they, may their memory be blessed, forbade (Yevamot 41a) him from marrying her sister from when she is bound to him, even though he did not designate her and did not do any action.
