Lekh Lekha 

לך לך

Abraham is commanded with regard to circumcision, and circumcises himself, Ishmael, and the male members of his household. The Sages describe the unique value of this mitzva. 

Rabbi says: Great is the mitzva of circumcision. As despite all the mitzvot that Abraham fulfilled, he was not called complete until he was circumcised, as it is stated: “Walk before Me, and be complete” (Genesis 17:1).<footnote data-num="41"/> <source>(<i>Tosefta</i> [Lieberman], <i>Nedarim</i> 2:5) </source>