וַאֲבָרֲ כָה מְ בָרְ כֶיָך ּומְ קַלֶּלְָך אָ אֹר וְנִבְ רְ כּו בְ ָך כֹּל מִ שְ ׁפְ ּחֹת וגו' (יב, ג)
And those who bless you will be blessed and those who curse you will be cursed, and they will bless with you all families… (12:3)
Sefer Likutei Yehuda quotes his grandfather, the Imrei Emes zy”a, as saying that when his brother, Rav Nechemiah zt”l, was three-years-old, he asked their father, the Sefas Emes zy”a, how the pasuk could first say speak about “those who curse you” and then say that “all families” will bless with you. If “all” families bless Avrohom, who are the one who curse him?
The Sefas Emes answered, “There are people who curse the Rov of their city, but everyone still blesses their son to grow up to like the Rov. So too, even though some people cursed Avrohom, everyone wanted their children to be like him!”