Reference for Eruvin 108:21
א"ל האידנא מאי שנא א"ל מדההיא שעתא דא"ל למר איכא מילתא דמצוה אסחאי לדעתאי וכל שעתא אמינא השתא קאי מר השתא קאי מר א"ל הב דעתיך ואתני ליך הדר תנא ליה ד' מאה זימני [אחריני]
and these finally might teach all Israel?<span class="x" onmousemove="('comment',' The four times required.');"><sup>42</sup></span> - As Moses learned from the mouth of the Omnipotent his own teaching was of greater value.<span class="x" onmousemove="('comment',' Lit., 'the thing is supported'.');"><sup>43</sup></span> The Master said: R'Judah stated: Aaron was always on Moses' right'. Whose view is represented in the following where it was taught: If three men were going the same way, the Master is to be in the middle, the more important of the other two<span class="x" onmousemove="('comment',' Lit., 'and the great'.');"><sup>44</sup></span>