זֹ֣את בְּרִיתִ֞י אֲשֶׁ֣ר תִּשְׁמְר֗וּ בֵּינִי֙ וּבֵ֣ינֵיכֶ֔ם וּבֵ֥ין זַרְעֲךָ֖ אַחֲרֶ֑יךָ הִמּ֥וֹל לָכֶ֖ם כָּל־זָכָֽר׃
This is My covenant, which ye shall keep, between Me and you and thy seed after thee: every male among you shall be circumcised.
Read kabbalistic (mystical) interpretation of Genesis 17:10: and classical mystical sources.