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In Shabbos (127a) the Gemara notes, in the name of Rabbi Yochanan, that, “Welcoming guests is as great as rising early to attend the beis midrash.” In the name of Rav Dimi of Naharda’a, the same Gemara writes that it is even greater than rising early to attend the beis midrash. Furthermore in the name of Rav Yehuda (citing Rav) we learn: “Welcoming guests is greater than greeting the Shechina.”

This latter statement is derived from the behavior of Avraham Avinu, who was standing before Hashem when he noticed guests approaching. The Gemara writes that upon seeing his guests Avraham said the words mentioned in the Pasuk (Bereishis 18:3) to Hashem: “If I have found favor in Your eyes, please do not leave me”—meaning, “Please wait while I go and greet the guests.”

For more see here.