וְאֵיבָ֣ה ׀ אָשִׁ֗ית בֵּֽינְךָ֙ וּבֵ֣ין הָֽאִשָּׁ֔ה וּבֵ֥ין זַרְעֲךָ֖ וּבֵ֣ין זַרְעָ֑הּ ה֚וּא יְשׁוּפְךָ֣ רֹ֔אשׁ וְאַתָּ֖ה תְּשׁוּפֶ֥נּוּ עָקֵֽב׃ (ס)
내가 너로 여자와 원수가 되게 하고 너의 후손도 여자의 후손과 원수가 되게 하리니 여자의 후손은 네 머리를 상하게 할 것이요 너는 그의 발꿈치를 상하게 할 것이니라 하시고
Sha'arei Orah
This is why whosoever does not bow when reciting the blessing of “submission-Modim-מודים,” after seventy years his spine will become a snake.81Talmud Bavli, Bava Kamma 16a The matter of seventy years is that it refers to the seventy ministering angels who stand in a circle [around the Sefirot] and the snake-Nachash-נחש is positioned to their exterior, standing in ambush around the qualities of victory-Netzach and majesty-Hod.82That is, the qualities of victory-Netzach and majesty-Hod are the two legs and feet, and it states about the snake-Nachash-נחש (Genesis 3:15), “You shall strike at their heel.”