Reference for Yevamot 27:16

בשלמא ב"ש מב"ה לא נמנעו דבני חייבי לאוין נינהו

— He gave his attendant the necessary instructions. Come and hear: THOUGH THESE FORBADE WHAT THE OTHERS PERMITTED&nbsp;… BETH SHAMMAI, NEVERTHELESS, DID NOT REFRAIN FROM MARRYING WOMEN FROM THE FAMILIES OF BETH HILLEL, NOR DID BETH HILLEL [REFRAIN FROM MARRYING WOMEN] FROM THE FAMILIES OF BETH SHAMMAI. Now, if it be said that they<span class="x" onmousemove="('comment',' Beth Shammai. ');">²⁷</span>

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