Musar zu Bereschit 24:60

Bereshit Rabbah 60,13 points out that as a result of Laban's blessing in Genesis 24,60: אחותנו את היי לאלפי רבבות, "Our sister! May you grow into thousands and tens of thousands," "thousands" i.e. אלו תימן, אלוף קנז, are descended from her through Esau, and "tens of thousands" i.e. רבבה כצמח השדה נתתיך, through Jacob as per Ezekiel 16,7. Laban eventually conceded the validity of these blessings. Even the part which was negative, i.e. the blessings for Esau, Laban "purified," i.e. he agreed for Esau to embrace true monotheism. This is evident from Laban's words in Genesis 24,50 "This matter was decreed by G–d; we cannot speak to you either bad or good." Laban acknowledges that everything is in the hands of G–d, and he says "here is Rebeccah, take her and go."