"And Jacob said to Rebekah his mother" (Genesis 27:11) — for the awe of his mother was upon him. "Behold, Esau my brother is a hairy man (ish sa'ir)" — as it is said, "And hairy ones (se'irim) shall dance there" (Isaiah 13:21). "And I am a smooth man (ish chalak)" — as it is said, "For the LORD's portion (chelek) is His people" (Deuteronomy 32:9).
Jacob the Smooth Man as the Lord's Portion in Genesis 27
Midrash Aggadah, Genesis 27:11
ויאמר יעקב אל רבקה אמו. שהיה עליו מוראת אמו: הן עשו אחי איש שעיר. כמו שנאמר ושעירים ירקדו שם (ישעי' יג כא): ואנכי איש חלק. כמו שנאמר כי חלק ה' עמו (דברים לב ט):