Parashas Vayeira · Passuk 18:1
Hashem appeared to him by the terebinths of Mamre; he was sitting at the entrance of the tent as the day grew hot.
Torah Temimah points to Bava Metzia 86b.
TT lemma: כחם היום.
English: “As the day grew hot.” What is the meaning of “as the day grew hot”? Rabbi Chama son of Rabbi Chanina said: That day was the third day after his circumcision; the Holy One, blessed be He, took the sun out of its sheath so that the righteous man would not be troubled by guests.
Derash on the verse (Bavli sugya) — not a formal named middah of the 13. The phrase “as the day grew hot” is read as a deliberate intensification of the sun’s heat for Avraham’s sake.
Hashem intensified the heat on the third day after the milah so that Avraham would not be burdened by ordinary travelers while recovering.