"And Esau said: I have plenty, my brother; let what you have remain yours" (Genesis 33:9). Rabbi Eibo said: because the blessings had been held in doubt in Jacob's hand, where were they made firm? Here, when Esau said to him "my brother, let what you have remain yours." "And Jacob said... for I have seen your face as one sees the face of God, and you have received me favorably" (Genesis 33:10). Rabbi Simeon said: it is permitted to flatter the wicked in this world, as it is said "the vile person shall no longer be called noble, nor the churl said to be generous" (Isaiah 32:5), which implies that in this world it is permitted. Resh Lakish said: from here, "as one sees the face of God, and you received me favorably." And this differs from Rabbi Levi, for Rabbi Levi said: to what may Jacob and Esau be compared? To a man who invited his fellow and discerned that he sought to kill him. He said to him: the taste of this dish that I am tasting is like a dish I tasted in the king's house. He said: the king knows him, so he was afraid and did not kill him.
Esau Concedes the Blessings and Whether One May Flatter the Wicked
Yalkut Shimoni on Torah 133:14
וַיֹּאמֶר עֵשָׂו יֶשׁ לִי רָב אָחִי יְהִי לְךָ אֲשֶׁר לָךְ. אָמַר רַבִּי אֵיבוֹ, לְפִי שֶׁהָיוּ הַבְּרָכוֹת מְפֻקְפָּקוֹת בְּיָדוֹ, וְהֵיכָן נִתְאוֹשְׁשׁוּ כָּאן, דְּאָמַר לֵיהּ אָחִי יְהִי לְךָ אֲשֶׁר לָךְ. (בראשית לג י) אָמַר רַבִּי שִׁמְעוֹן מֻתָּר לְהַחֲנִיף לָרְשָׁעִים בָּעוֹלָם הַזֶּה, שֶׁנֶּאֱמַר (ישעיה לב, ה) ("ו)לֹא יִקָּרֵא עוֹד לְנָבָל נָדִיב וּלְכִילַי לֹא יֵאָמֵר שׁוֹעַ" מִכְלָל דְּבָעוֹלָם הַזֶּה שָׁרִי. רֵישׁ לָקִישׁ אָמַר, מֵהָכָא כִּרְאֹת פְּנֵי אֱלֹהִים וַתִּרְצֵנִי, וּפְלִיגָא דְרַבִּי לֵוִי דְאָמַר רַבִּי לֵוִי, מָשָׁל דְיַעֲקֹב וְעֵשָׂו לְמָה הוּא דּוֹמֶה, לְאָדָם שֶׁזִמֵּן אֶת חֲבֵרוֹ וְהִכִּיר בּוֹ שֶׁמְּבַקֵּשׁ לְהָרְגוֹ, אָמַר לוֹ, טַעַם תַּבְשִׁיל זֶה שֶׁאֲנִי טוֹעֵם כְּתַבְשִׁיל שֶׁטָּעַמְתִּי בְּבֵית הַמֶּלֶךְ, אָמַר, יָדַע בֵּיהּ מַלְכָּא, מִסְתָּפֵי וְלֹא קָטְלָא לֵיהּ.