The wicked Esau said: I will not kill Jacob with bow and arrows, but with my mouth and my teeth I will kill him and suck his blood, as it is said "and Esau ran to meet him" (Genesis 33:4). Do not read "and he kissed him" [vayishakehu] but "and he bit him" [vayishakhehu]. And Jacob's neck became like marble, and concerning him Scripture says "your neck is like the tower of ivory" (Song of Songs 7:5). And the teeth of Esau were blunted, and he began to be angry and to grind his teeth, as it is said "the wicked will see and be vexed, he will gnash his teeth and melt away" (Psalms 112:10).
Esau Plots to Drink Jacob's Blood and Bites Marble
Yalkut Shimoni on Torah 133:12
אָמַר עֵשָׂו הָרָשָׁע, אֵינִי הוֹרֵג אֶת יַעֲקֹב בְּקֶשֶׁת וּבְחִצִים אֶלָּא בְּפִי וּבְשִׁנַּי אֲנִי הוֹרְגוֹ וּמוֹצֵץ אֶת דָמוֹ, שֶׁנֶּאֱמַר וַיָּרָץ עֵשָׂו לִקְרָאתוֹ אַל תִּקְרֵי 'וַיִּשָּׁקֵהוּ' אֶלָא 'וַיִּשָּׁכֵהוּ' וְנַעֲשָׂה צַוָּארוֹ שֶׁל יַעֲקֹב כְּשָׁיִשׁ, וְעָלָיו הַכָּתוּב אוֹמֵר "צַוָּארֵךְ כְּמִגְדַּל הַשֵּׁן", וְקָהוּ שִׁנָּיו שֶׁל עֵשָׂו וְהִתְחִיל כּוֹעֵס וְחוֹרֵק בְּשִׁנָּיו, שֶׁנֶּאֱמַר (תהלים קיב, י) "רָשָׁע יִרְאֶה וְכָעָס" וְגוֹ'.