Reference for Temurah 58:28

אחד אתנן זכר ואחד אתנן כל עריות אסור חוץ מאתנן אשתו נדה

we suppose that he said to her: 'Submit to intercourse for this lamb,'<span class="x" onmousemove="('comment',' And since he gave it to her at the time of intercourse, the law of hire has effect immediately on the animal and even if she did not receive it till twelve months later, it is forbidden for the altar (v. Sh. Mek.) .');">²¹</span>

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