Reference for Chullin 199:13

אמר ליה רב ספרא לאביי

Rab thereupon appointed an Amora<span class="x" onmousemove="('comment',' 'Speaker', 'interpreter'; the person who attended upon the lecturer for the purpose of expounding at length and in popular style the main points of the discourse given to him by the latter.');">⁷</span>

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