Chasidut do Rodzaju 18:3

In the Talmud of Shabbat (127a): Rav Yehudah quoted Rav: Welcoming guests is more important than receiving the Face of the Shekhinah, as it says, do not pass by your servant (Gen. 18:3). Rabbi Elazar said: Come and see that the character of the Holy Blessed One is not like the character of flesh and blood – the character of flesh and blood, the lesser can not say to the greater, “Wait until I come to you;” but regarding the Holy Blessed One, [Abraham] says, do not pass by your servant etc.