וּבֶן־שְׁמֹנַ֣ת יָמִ֗ים יִמּ֥וֹל לָכֶ֛ם כָּל־זָכָ֖ר לְדֹרֹתֵיכֶ֑ם יְלִ֣יד בָּ֔יִת וּמִקְנַת־כֶּ֙סֶף֙ מִכֹּ֣ל בֶּן־נֵכָ֔ר אֲשֶׁ֛ר לֹ֥א מִֽזַּרְעֲךָ֖ הֽוּא׃
대대로 남자는 집에서 난 자나 혹 너희 자손이 아니요 이방 사람에게서 돈으로 산 자를 무론하고 난 지 팔 일 만에 할례를 받을 것이라
Sefat Emet
In the midrash “human and beast…” (Psalms 36:7), “and when he is eight days old he should be circumcised” (Genesis 17:12), that he should see the face of the matron first (Vayikra Rabbah 27:10). Because it is written, “give a portion to seven and also to eight” (Ecclesiastes 11:2). “To seven” – seven days of creation. “To eight” – eight days until circumcision (Kohelet Rabbah 11:2). The explanation is that circumcision is the aspect of eight which is above nature. And we can come to this through the aspect of the Sabbath, to bring the sanctity of the holy Sabbath also into the days of the week. And this is giving a portion to seven, because the Sabbath is a taste of the World to Come. And through them we are able to also come to the aspect of eight.
Kedushat Levi
Genesis 17,13., “to be circumcised, etc.:” [what follows is not documented although the author quotes Bereshit Rabbah, 49. It is not found there, nor in Bereshit Rabbah 47, where it ought to be, if at all. The author himself appears to have had his doubts, and this is why he attributes the so-called “quote” די לעבד להיות כרבו, “it is appropriate for a servant to emulate his master,” to a statement in the Levush. The authenticity of the statement has been questioned as it implies that just as G’d is “circumcised,” so His favourite creatures must be. I will content myself with paraphrasing the thoughts of the author. We know that in order to create a physical world, G’d had to “reduce” the impact of His emanations, or to be מצמצם, “to understate the extent of His brilliance.” In order for G’d to conclude a covenant with Avraham in his capacity as the founder of the Jewish people, G’d’s “junior” partner on earth, he and the people under his authority had to perform a symbolic act on their body, i.e. the removal of their foreskin. By doing this they emulated an attribute used by their Creator. This explanation may answer the question that if G’d created everything in His universe in a perfect state, (compare Genesis 1,31) why would it be necessary at this stage for Avraham to remove a G’d given part of his body? Ed.]