השמרו לכם. כֵּיוָן שֶׁתִּהְיוּ אוֹכְלִים וּשְׂבֵעִים הִשָּׁמְרוּ לָכֶם שֶׁלֹּא תִבְעֲטוּ, שֶׁאֵין אָדָם מוֹרֵד בְּהַקָּדוֹשׁ בָּרוּךְ הוּא אֶלָּא מִתּוֹךְ שְׂבִיעָה, שֶׁנֶּאֱמַר "פֶּן תֹּאכַל וְשָׂבָעְתָּ וּבְקָרְךָ וְצֹאנְךָ יִרְבְּיֻן" (דברים ח'), מַה הוּא אוֹמֵר אַחֲרָיו? "וְרָם לְבָבֶךָ וְשָׁכַחְתָּ": TAKE HEED [THAT YOUR HEART MISLEAD YOU NOT] — when you have eaten and are full, take heed to yourselves that you kick not against God; for usually no man rebels against the Holy One, blessed be He, except out of satiety, as it is said, (Deuteronomy 8:12—14) “Lest thou eat and art full … and thy herds and flocks increase”. What is stated after this? “And thy heart be lifted up and thou forget [the Lord thy God]” (Sifrei Devarim 43:7).
וסרתם. לִפְרֹשׁ מִן הַתּוֹרָה, וּמִתּוֹךְ כָּךְ ועבדתם אלהים אחרים, שֶׁכֵּיוָן שֶׁאָדָם פּוֹרֵשׁ מִן הַתּוֹרָה הוֹלֵךְ וּמִדַּבֵּק בַּעֲ"זָ, וְכֵן דָּוִד אוֹמֵר "כִּי גֵרְשׁוּנִי הַיּוֹם מֵהִסְתַּפֵּחַ בְּנַחֲלַת ה' לֵאמֹר לֵךְ עֲבֹד וְגוֹ'" (שמואל א כ"ו), וּמִי אָמַר לוֹ כֵן? אֶלָּא כֵּיוָן שֶׁאֲנִי מְגֹרָשׁ מִלַּעֲסֹק בַּתּוֹרָה, הֲרֵינִי קָרוֹב לַעֲבֹד אֱלֹהִים אֲחֵרִים: וסרתם AND YE TURN ASIDE, to depart from the Torah, and through this, ועבדתם אלהים אחרים YE WILL SERVE OTHER GODS, for so soon as a man departs from the Torah he goes and clings to idol-worship. Similarly did David say, (I Samuel 26:19) “For they have driven me out this day, that I should not cleave to the inheritance of the Lord (the Torah) saying, Go, serve other gods”. But who had really said thus to him?! But he meant: Since I am driven out so that I can no longer occupy myself with the Torah, I am nearly exposed to the danger of serving other gods (Sifrei Devarim 43:14).
אלהים אחרים. שֶׁהֵם אֲחֵרִים לְעוֹבְדֵיהֶם – צוֹעֵק אֵלָיו וְאֵינוֹ עוֹנֵהוּ, נִמְצָא עָשׂוּי לוֹ כְּנָכְרִי (ספרי): אלהים אחרים OTHER GODS — i.e. gods that are other (alien) to those who worship them: one calls to it, and it does not answer him; consequently it becomes to him like a stranger (Sifrei Devarim 43:17).