parsha bit: Vayeira

The torah tells us that God appeared to Avraham, three days after his circumcision, in the heat of the day. Why is the heat mentioned? Avraham was reknowned for his hospitality, and the talmud tells us that God did not want him to exert himself so soon, so he made a hot day so there would be no travellers. However, Avraham, seeing that there were no visitors, sent his servant Eliezer out in search of travellers, and when Eliezer found none Avraham went out himself to search. Then God sent the three messengers -- Micha'el to bring news to Sarah, Rafa'el to heal Avraham, and Gavri'el to overturn S'dom. (Bava Metzia 86b)