Reference for Bava Batra 248:3

ורב נחמן דידיה אמר מותר לעשות כדברי רבי קא סבר הלכה כרבי מחבירו ואפילו מחביריו

R. Nahman said in the name of Rab, 'It is forbidden to act in accordance with the decision of Rabbi,<span class="x" onmousemove="('comment',' And here he is opposed by his colleagues, a majority. ');">⁵</span> for he holds the opinion [that] the <i>halachah</i> is in accordance [with] Rabbi, [when in opposition to] his colleague, but not [when he is opposed to] his colleagues.' R. Nahman in his own name,<span class="x" onmousemove="('comment',' Lit., 'If his'. ');">⁶</span>

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