Reference for Chullin 88:7

והיכי עביד הכי

Has it not been taught: 'If a Sage has declared aught unclean his colleague may not declare it clean, or if he has declared aught forbidden his colleague may not permit it'? - This case is different for Rab did not declare it forbidden.<span class="x" onmousemove="('comment',' Rab came to no decision in the case.');">⁴</span>

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