Reference for Sotah 82:13
ואמר רבי אלעזר כל אדם שיש בו חנופה אפילו עוברין שבמעי אמן מקללין אותו שנא' (משלי כד, כד) אומר לרשע צדיק אתה יקבוהו עמים יזעמוהו לאומים ואין קוב אלא קללה שנא' (במדבר כג, ח) לא קבה אל ואין לאום אלא עוברין שנא' (בראשית כה, כג) ולאום מלאום יאמץ
On this point he is at variance with R. Levi; for R. Levi said: A parable of Jacob and Esau: To what is the matter like? To a man who invited his neighbour to a meal, and the latter perceived that he wished to kill him. So he said to him, 'The taste of this dish of which I am partaking is like the dish I tasted in the king's palace'. The other said [to himself]. 'He is acquainted with the king!' So he became afraid and did not kill him.<span class="x" onmousemove="('comment',' Similarly Jacob's words were not flattery, but spoken with the intention of frightening Esau. ');"><sup>11</sup></span>