Commentary for Kiddushin 65:12
אלא יכול יעצים עיניו מקמי דלימטיה זמן חיובא דכי מטא זמן חיובא הא לא חזי ליה דקאים מקמיה ת"ל תקום ויראת
Say, that is four cubits.<span class="x" onmousemove="('comment',' When the Sage comes within four cubits of him he must rise, for then it is evident that he is rising in his honour.');"><sup>18</sup></span> Said Abaye: That was said only of one who is not his distinguished teacher;<span class="x" onmousemove="('comment',' I.e., either a greater scholar than himself, even if he has never studied under him, or one of his own rank from whom he has learnt something, but not the greater part of his knowledge. Tosaf. Ri.');"><sup>19</sup></span> but as for his teacher par excellence,<span class="x" onmousemove="('comment',' His principal teacher.');"><sup>20</sup></span>