Commentary for Sanhedrin 118:3

והרי פריה ורביה שנאמרה לבני נח דכתיב (בראשית ט, ז) ואתם פרו ורבו ונשנית בסיני (דברים ה, כו) לך אמור להם שובו לכם לאהליכם לישראל נאמרה ולא לבני נח

was nevertheless commanded to Israel but not to the heathens? — That repetition was to teach that whatever has been constitutionally forbidden by a majority vote requires another majority vote to abrogate it.<span class="x" onmousemove="('comment',' Although the prohibition in Ex. XIX, 15 was explicitly limited to three days, yet after that it did not cease automatically, but was formally abrogated. This proves that any prohibition constitutionally imposed, as by a majority of the Sanhedrin, even for a limited period, must be constitutionally repealed thereafter. Hence the repetition being necessary, it is not subject to the general principle. — So Rashi. Tosaf however, (here and in Bezah 5a) maintains that a temporary prohibition automatically ceases at the end of its period. Accordingly, Ex. XIX, 15 is to be translated: Be ready against the third day (for God's Revelation); approach not your wives (for an unspecified period). Tosaf. therefore substitutes this explanation: A prohibitory measure, constitutionally passed, does not automatically cease when its reason no longer exists. Thus in this case the prohibition was obviously on account of the approaching Revelation, yet after the Revelation, when there was no longer any reason for its continuance, it had to be formally revoked. ');">⁶</span>

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