Kabbalah sa Genesis 17:11: Sha'arei Orah

We must now inform you that the Shabbat, which is the quality of the Living God-El Chai-א"ל חי, is called a sign-Ot-אות, in that HaShem-יהו"ה said,¹⁵⁴Exodus 31:17 “It is a sign-Ot-אות between Me and the children of Israel forever.” The covenant of the circumcision-Brit Milah-ברית מילה is also called a sign-Ot-אות, as He said,¹⁵⁵Genesis 17:11 “You shall circumcise the flesh of your foreskin and it shall be a sign-Ot-אות of the covenant between Me and you.” This matter is hinted at in the blessing of the circumcision; “Blessed are You HaShem-יהו"ה our God, King of the universe, who sanctified the beloved one from the womb, set His statute in his flesh, and sealed his descendants with the sign-Ot-אות of the Holy Covenant. Therefore, as reward for this, the Living God-El Chai-א"ל חי, our Portion, our Rock, has ordained that the beloved of our flesh be saved from the abyss, for the sake of His Covenant that He has set in our flesh. Blessed are You HaShem-יהו"ה, who makes the Covenant-Brit-ברית.” The rainbow is also called a sign-Ot-אות, as He said,¹⁵⁶Genesis 9:13 “I placed My rainbow in the cloud and it shall be a sign-Ot-אות of the Covenant between Me and the earth.” As we have already informed you, the covenant of the rainbow is also the covenant of the Living God-El Chai-א"ל חי.