Reference for Bava Batra 248:1

מספקא ליה אי הלכה כרבי מחבירו ולא מחביריו או הלכה כרבי מחבירו ואפילו מחביריו

[For] he<span class="x" onmousemove="('comment',' R. Hiyya. ');">¹</span> was in doubt as to whether the <i>halachah</i> is in accordance [with the decision of] Rabbi [when it is in opposition to that] of his colleague,<span class="x" onmousemove="('comment',' Cf. 'Er. 46b; Pes. 27a; Keth. 21a and 51a. ');">²</span>

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