Reference for Nedarim 108:1

מי לא מודה רבי עקיבא דצריך אימלוכי איתמר שמעתא קמיה דרבא אמר להון שפיר אמר נחמני

does not R. Akiba admit that he must consult [his principal]?<span class="x" onmousemove="('comment',' Though maintaining that it is of the same species, R. Akiba agrees that a servant should not take meat when ordered to get liver without further instructions. Consequently his action is regarded as his own. ');">¹</span>

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