dafyomi: Moshe Rabbeinu also only said Shema once to K’lal Yisrael (okay, 4 times; sort of). According to this part of the Gemara, we have a Mitzvah to say Shema because Yaakov sons did. So, since at the time that happened Yaakov added in a line, we do too. Just not out loud because it wasn’t recorded in Chumash.
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