In discussion of the weekly Parasha, focus is placed not only on each individual letter and word but also on sefer Bereishis as a whole. This allows a new perspective which includes an understanding of the parallels in the book. As this is understood, the Misorah and continuity of Zera Avraham and who are and are not michuyav in Bris Milah is concertized according to the opinion of the Rambam.