For the source text click/tap here: Yoma 28
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When God reveals Himself to Isaac with the blessing of the covenant, He tells him that He is doing so: “because Abraham hearkened to My voice, and kept My charge, My commandments, My statutes, and My laws” (Genesis 26:5).
Our Daf (Yoma 28b) interprets this verse to imply that Abraham performed the Torah entirely, both written and oral, including rabbinic enactments made thousands of years later.
The Midrash expands such observance to include all the patriarchs, and indeed, all the leaders of the nation who preceded the giving of the Torah.
We examine the history of the idea that Avraham Avinu instituted Mincha and even kept Eruv Tavshilin.
We look at the Nesivos Sholom's mystical insight as to intuiting Torah in his introduction to his majestic commentary to Genesis. (Akdomus Milin 3)