TT #59 · Parashas Vayeira · Passuk 19:27
And Avraham rose early in the morning to the place where he had stood before Hashem.
Torah Temimah points to Berachos 26b. E-Daf · Sefaria — Berachos 26b
TT lemma: וישכם.
“And he rose early…” It was taught: Avraham instituted the morning prayer, as it is said, “And Avraham rose early in the morning to the place where he had stood,” and “standing” means only prayer, as it is said, “And Pinchos stood up and prayed.”
Derash on the verse (Bavli sugya) — not a formal named middah of the 13. The verb “amad” is equated with prayer by means of a parallel verse.
Avraham established the morning prayer; his early rising and standing before Hashem is the scriptural source for Shacharis.