וְהָי֞וּ הַדְּבָרִ֣ים הָאֵ֗לֶּה אֲשֶׁ֨ר אָנֹכִ֧י מְצַוְּךָ֛ הַיּ֖וֹם עַל־לְבָבֶֽךָ׃
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Tosefta Sotah
The blessing of the Hallel, the Shema, and the tefilah (i.e., the Amidah) may be recited in any language (cf. Sot. 7:1). Rebbi says, I say that the Shema may only be recited in the Holy tongue, as it is said (Deut. 6:6), "And these words, etc."