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According to Rashi to Devarim 3:24 (here):
לאמר TO SAY (i.e. that God should say) — This is one of the three occasions where Moses spoke before the Omnipresent: I will not let You go until You tell me whether You will fulfill my request or not (Sifrei Devarim 26:9; cf. Rashi on Numbers 12:13).
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