Reference for Yevamot 27:17

אלא ב"ה מבית שמאי אמאי לא נמנעו בני חייבי כריתות ממזרים נינהו

did not act [in accordance with their own view] one can well understand why THEY DID NOT REFRAIN [from intermarrying with one another].<span class="x" onmousemove="('comment',' Since, in practice, both schools followed the same principles. ');">²⁸</span> If, however, it be said that they<span class="x" onmousemove="('comment',' Beth Shammai. ');">²⁷</span>

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