וַיֹּ֣אמֶר עֵשָׂ֔ו הִנֵּ֛ה אָנֹכִ֥י הוֹלֵ֖ךְ לָמ֑וּת וְלָמָּה־זֶּ֥ה לִ֖י בְּכֹרָֽה׃
And Esau said: ‘Behold, I am at the point to die; and what profit shall the birthright do to me?’
Read kabbalistic (mystical) interpretation of Genesis 25:32: and classical mystical sources.