Reference for Yevamot 27:5

ואי בעית אימא לאחר בת קול מ"ד לא עשו דהא נפקא בת קול ומ"ד עשו רבי יהושע היא דאמר אין משגיחין בבת קול

in this case, however, Beth Shammai were keener of intellect. <font>'And if you prefer I could say, after the heavenly voice'; one maintains that they<span class="x" onmousemove="('comment',' Beth Shammai. ');">⁵</span></font> did not act [according to their view] for the obvious reason that the heavenly voice had already gone forth;<span class="x" onmousemove="('comment',' And decided the issue in favour of Beth Hillel. ');">⁸</span>

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