Related for Chullin 181:40

(בראשית לב, כו) בהאבקו עמו כאדם שחובק את חבירו וידו מגעת לכף ימינו של חבירו

R'Samuel B'Aha said in the name of Raba B'Ulla in the presence of R'Papa: He appeared to him as one of the wise, and the Master has said: Whosoever walks at the right hand of his teacher is uncultured.<span class="x" onmousemove="('comment',' Jacob regarding the angel as a scholar took his place at the left hand of the other and so was injured in his right thigh, the side nearest to the angel.');">²³</span>

Maharam Schiff on Chullin