Reference for Bava Batra 248:4

אמר רבא אסור לעשות כדברי רבי ואם עשה עשוי קא סבר מטין איתמר

however, said, 'It is permitted to act in accordance with the decision of Rabbi'; for he holds the opinion [that] the <i>halachah</i> is in accordance [with] Rabbi [when in opposition to] his colleague and even [when opposed to] his colleagues. Raba said, 'It is forbidden to act in accordance with the decision of Rabbi, but if one did act [accordingly], his action is legally valid;'<span class="x" onmousemove="('comment',' Lit., 'is done'. ');">⁷</span>

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