וְיִֽתֶּן־לְךָ֙ אֶת־בִּרְכַּ֣ת אַבְרָהָ֔ם לְךָ֖ וּלְזַרְעֲךָ֣ אִתָּ֑ךְ לְרִשְׁתְּךָ֙ אֶת־אֶ֣רֶץ מְגֻרֶ֔יךָ אֲשֶׁר־נָתַ֥ן אֱלֹהִ֖ים לְאַבְרָהָֽם׃
at ibigay nawa Niya sa iyo ang pagpapala ni Abraham, sa iyo at sa iyong lahi na kasama mo, upang iyong manahin ang lupaing tinatahanan mo bilang dayuhan, na ibinigay ng Diyos kay Abraham.”
Mishneh Torah, Kings and Wars
Circumcision was only commanded of Abraham and his descendents, as it says, “You and your descendents who will follow you throughout the generations” (Genesis 17:9). Ishmael’s descendents are excluded from this Commandment, as it says, “For through Isaac shall your descendents be called yours” (Genesis 21:12). Esau is excluded since Isaac said to Jacob, “and he shall give the blessing of Abraham to you and to your descendents” (Genesis 28:4). Since he, alone, was the descendent of Abraham who stood fast with his religion and his upright ways, it is his progeny who were commanded with circumcision.