Musar para sa Genesis 17:4

We read in the Sefer Habahir, that the reason the Torah commands circumcision to be performed on the eighth day of the infant's life is that man possesses eight extremities, i.e. his right and left hand, the right and left foot, the head, the body, the male member and its mate, since the Torah describes man as "ודבק אשתו והיו לבשר אחד, "he cleaves to his wife so that they become one flesh” (Genesis 2,24). When G–d said to Abraham: אני הנני בריתי אתך, "I, here My covenant is with you," this is a reference to the fact that the שכינה is known as Ani, and that the heavenly covenant is symbolized on the body by a ציון, a mark. Once the male glans is uncovered, this enables the שכינה to return to ציון, Zion, and man on earth remains whole, retains the image of G–d. When that condition exists, all his 248 limbs are whole, and this is what the name 248=אברהם represents. When in that condition, Abraham is able to enter the Zion on this earth. We can then be a nation on our own land for the imprint of G–d is on our bodies. This seal signifies that we are permanently different and distinct from the other nations and are indeed part of the holiness of G–d.