Musar su Genesi 21:10

When it comes to ridding the world of the קליפות, the spiritually negative pollutants, Abraham is secondary to Sarah. This is so in spite of the fact that Abraham's soul was connected directly to the source of the light that has been hidden, and which contains the power to purify that which is impure when it is once more released into this world. When we speak about Abraham being the first to remove part of the קליפות, it is because of his soul's origin. Seeing that the קליפות were released into this world through Adam and that Abraham was Adam's first תקון, these קליפות when being removed from our world are eliminated via Abraham on their way back to oblivion. Abraham is the מכניס גרים, the chief of the proselytizers, seeing that the חיצונים, those outside the fold are redeemable, will become purified and become פנימיים, "insiders." Sarah's outstanding quality lay in her diminishing the influence of the קליפות at the time when they were rampant in the world known as נקבה, female. She chose the path of פנימיות, She did not produce any קליפה, as opposed to Abraham when the latter sired Ishmael. Isaac's son Esau, by marrying a daughter of Ishmael, established a bond with that קליפה. Sarah, on the other hand, wanted the mother of that קליפה, whom she described as האמה הזאת, "this slave woman," removed together with her son. Even though Esau indirectly also was a descendant of Sarah, for he was her grandson, she was still superior to Abraham in that she recognized the evil influence of the קליפה. If Ishmael had remained alone, not partnered by Esau, his evil influence would have been far more negligible. Even though Ishmael and Esau did not live in the same region, did not even maintain peaceful relations, as is the custom among the קליפות, they still gave each other moral support in their spiritually negative outlook.