What are the implications of the phrase "Lih'yos l'cha l'Elokim u'le'Zar'acha Acharecha"?
Rashi (in Vayeitzei): It implies that none of his children will be Pasul (through forbidden marriages). 1
Refer to 28:21:2:1. Since the Shechinah only rests on those who are Meyuchas (Sanhedrin, 39b).