Reference for Sanhedrin 128:8
דרשה אחרינא הוא זרעו אין לי אלא זרע כשר זרע פסול מנין ת"ל בתתו מזרעו
Thus: [<i>because he hath given</i>] <i>of his seed</i>: From this I know only that the law applies to legitimate seed [that being the normal meaning of the word]; whence do I know that it also applies to illegitimate seed?<span class="x" onmousemove="('comment',' Not in the modern sense, but seed from a woman forbidden to him. ');"><sup>11</sup></span>
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