EXOD286 We should be eager to serve food to Torah scholars. … Where was Moshe? The Midrash replies that Moshe stood before them and served them. When Rabbi Gamliel made a feast for Torah scholars, all the scholars in Israel came and Rabbi Gamliel personally served them. When the Sages protested that they could not allow Rabbi Gamliel to do so, Rabbi Yehoshua rabbi told them ,"Let him serve, for we find someone greater than him who also served his guess. If Avraham deemed it fit to serve the angels who he thought were idol worshipers, all the more so should Rabbi Gamliel be allowed to serve scholars who study Torah." Rabbi Tzodok then told them, "we find someone even greater than both Rabbi Gamliel and Avraham who serves people. The Almighty constantly supplies food to the entire world; not only to the righteous, but even to idol worshipers. All the more reason that Rabbi Gamliel should serve Torah scholars." (Mechilta 18:12)