וַיִּוָּתֵ֥ר יַעֲקֹ֖ב לְבַדּ֑וֹ וַיֵּאָבֵ֥ק אִישׁ֙ עִמּ֔וֹ עַ֖ד עֲל֥וֹת הַשָּֽׁחַר׃
And Yaakov was left alone, and a man wrestled with him until the rise of dawn.
Chullin 91a / Bereshit Rabbah 77:2.
ויאבק איש עמו — זה שרו של עשו.
“And a man wrestled with him” — this is the guardian angel of Eisav.
The classical sources identify the adversary as the celestial representative of Eisav.
Derash on the identity of the wrestler (Bavli / Midrash).
The man who wrestled with Yaakov is identified as the angel of Eisav.