"And is a Jew excluded from the category of bnei Noach? Since Avraham was sanctified they are called by my name"
״וישראל מי נפיק מכלל בני נח? כיון דאיקדש אברהם איתקרו על שמיה״
-Talmud Bavli, Nedarim 31a
What was the sanctification of Avraham? Was it an act? Was it circumcision? His trials?