Midrash Tanchuma Buber, Appendix to Vaetchanan
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אנכי ה' אלהיך (דברים ה ו). למה פתח בלשון יחיד, ולא אמר אלהיכם, אמר רבי שמעון כדי ליתן סניגוריא, שבו למד משה סניגוריא במעשה העגל, אמר לו על מה אתה כועס, למה [ה'] יחרה אפך בעמך (שמות לב יא), כלום צוית להם.
(Deut. 5:1) I AM THE LORD YOUR GOD. Why did Moses begin with the word YOUR in the singular and not say, "Your God" (with "your" in the plural)? Rabbi Simeon has said: In order to give a defence,¹⁷ in which Moses argued a defence (before the Holy One) for the act of the golden calf. He said to him: Why are you angry? (Exod. 32:11:) WHY, [O LORD], DOES YOUR WRATH BURN AGAINST YOUR PEOPLE? Have you given them some commandment?¹⁸
footnotes: ¹⁷ Gk.: synegoria. ¹⁸ The making of the golden calf took place before the people had received any commandments at Sinai.
חסלת הוספה לפר' ואתחנן
The End of the Supplement to Parashah Wa'ethannan