Sam, according to what you said, Avraham Avinu wouldn’t have kept any Yom Tov (besides for Rosh Hashana and maybe Yom Kipper), and you suggested that Shabbos wasn’t either kept. However, you mentioned that according to a Girsa (the common one) he kept Derabanans. This Derabanan was Eiruvei Tavshilin, which includes both, Shabbos and Yom Tov.
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