The talmidim of Avraham Avinu
The Mishnah asks how one recognizes a talmid of Avraham Avinu, and answers with three traits: a good eye, a humble spirit and a modest appetite. The Bartenura finds each trait in Avraham himself: a good eye, content with what he had, when he refused to take even a thread or a shoelace from the king of Sedom; a humble spirit, when he said before Hashem, "I am dust and ashes"; and a modest appetite, in his great modesty toward Sarah. Being Avraham's child is not only a matter of descent, but of carrying his middos, and the Mishnah promises that his talmidim enjoy this world and inherit the World to Come.
Source: Pirkei Avos 5:19, with Bartenura
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