Reference for Bava Batra 32:16

והא ישמעאל דכתיב ביה גויעה ואסיפה אדהכי איתער בהו רבא אמר להו דרדקי הכי א"ר יוחנן ישמעאל עשה תשובה בחיי אביו שנאמר (בראשית כה, ט) ויקברו אותו יצחק וישמעאל בניו

[We know that] he denied God, because it is written here, What benefit is this to me, and it is written in another place, This is my God and I will make him an habitation.<span class="x" onmousemove="('comment',' Ex. XV, 2. ');">³⁰</span> [We know that] he denied the resurrection of the dead because he said, Behold, I am on the way to die: also that he spurned the birthright because it is written, So Esau despised his birthright.

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