Parashas Chayei Sarah · Passuk 23:12
And Avraham bowed before the people of the land.
Classical midrash on repeated bowing (classical source on this passuk; not listed as a numbered Torah Temimah unit here).
Lemma / focus: וישתחו אברהם.
English: Avraham bowed twice—once at the beginning of the negotiation and once at its end—to teach his humility.
Derash on the verse (midrashic doubling) — not a formal named middah of the 13: the repeated act is taken as a deliberate pattern of humility.
Avraham bowed both at the opening and near the close of the negotiation; the doubled bowing marks his sustained humility before the people of the land.