And it once happened that R. Yishmael and R. Elazar b. Azaryah were together in one place, R. Yishmael expounding reclining, and R. Elazar b. Azaryah, standing. When the time for the (evening) Shema arrived, R. Elazar b. Azaryah reclined and R. Yishmael stood up — whereupon R. Elazar b. Azaryah said to R. Yishmael: "Yishmael, my brother, what you are doing may be compared to one's being told 'Your beard is (beautifully) long' and his replying (spitefully) "Let it be shorn then!'" R. Yishmael countered: ("I was not being spiteful, but) you reclined in accordance with the words of Beth Shammai, and I stood up in accordance with the words of Beth Hillel. Variantly: (I stood up) so that this (i.e., lying down) not be established as the rule (for future generations.)