The Gemara says that Avraham established Shacharis, Yitzchak established Mincha etc. – but don’t we know that Avraham kept the entire Torah (Yoma 28b) which presumably would include all the tefillos as well?
Brachos 26 – ברכות כו
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The Gemara says that Avraham established Shacharis, Yitzchak established Mincha etc. – but don’t we know that Avraham kept the entire Torah (Yoma 28b) which presumably would include all the tefillos as well?