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Ramban on Deuteronomy 28:14/רמב"ן על דברים כ״ח:י״ד

אוְלֹא תָסוּר מִכָּל הַדְּבָרִים, נִמְשָׁךְ עִם כִּי תִשְׁמַע (דברים כ"ח:י"ג), שֶׁיָּבוֹאוּ עָלֶיךָ כָּל הַבְּרָכוֹת הָאֵלֶּה כַּאֲשֶׁר תִּשְׁמַע לְמִצְוֹתָיו וְכַאֲשֶׁר לֹא תָּסוּר יָמִין וּשְׂמֹאל מִכָּל הַדְּבָרִים אֲשֶׁר אָנֹכִי מְצַוְּךָ בְּעִנְיַן עֲבוֹדָה זָרָה, שֶׁאִם תֵּלֵךְ אַחֲרֵי אֱלֹהִים אֲחֵרִים לְעָבְדָם כְּבָר סַרְתָּ מִכָּל מִצְוֹתָיו וְאֵין חֵפֶץ כְּלָל בְּכָל הַמִּצְוֹת שֶׁתַּעֲשֶׂה. וְאֵינֶנּוּ כְּדִבְרֵי בַּעַל הַהֲלָכוֹת שֶׁמְּנָאוֹ מִצְוַת לֹא תַעֲשֶׂה:
1AND THOU SHALT NOT TURN ASIDE FROM ANY OF THE WORDS WHICH I COMMAND YOU THIS DAY. This is connected with the expression [in the preceding Verse 13] if thou shalt hearken, meaning that all these blessings will come upon you when you will hearken to His commandments, and when you will not turn aside to the right, or to the left85 from any of the words which I command you concerning idolatry. For, if you will go after other gods to serve them85 you will already have turned aside from all His commandments86, is thus not an independent negative commandment, as the author of the “Hilchoth Gedoloth” would have it, but is rather to be understood in connection with the concluding part of that verse, to go after other gods to serve them, meaning to say: if you will go after other gods to serve them, you will already have turned aside from any of the words which, command you this day. and He shall have no desire whatever for any of the commandments you may observe. The sense of the verse is thus unlike the words of the “Hilchoth Gedoloth”59 contained in the Torah. The listing is in the preface to his work “Hilchoth Gedoloth”. His concept was utilized by the Paitanim, the writers of liturgical poetry who wrote various Azharoth (Exhortations), liturgical poems containing the Divine Commandments. — It should be noted that while the “Hilchoth Gedoloth” contains the first historical record in our possession of an attempt at enumerating the individual commandments, there is no doubt that the author drew upon older sources of such lists, and as Rabbeinu Saadia Gaon writes here, such “a list of the commandments” was written upon the stones by Moses. who counted this verse as a negative commandment.