[In] three matters Rabban Gamliel rules stringently in accordance with Beis Shammai: (a) One may not insulate hot water on Yom Tov for the Sabbath, and (b) one may not straigh-ten a candlestick on Yom Tov, and (c) one may not bake thick loaves of bread [on Yom Tov], only wafers. Rabban Gamliel said: “In all the days of my father's household they would never bake thick loaves of bread [on Yom Tov], only wafers.” They [the Sages who disagreed with Rabban Gam-liel] said to him: “And what shall we do with your father's household? They were stringent upon themselves but they ruled leniently for [the people of] Israel, allowing them to bake thick loaves of bread and [even] coal-baked bread [on Yom Tov].”