teaches that God gave the righteous one day — Yom Kippur. Similarly, Rabbi Judah bar Simon interpreted , "And God called the light day," to symbolize Jacob/Israel; "and the darkness he called night," to symbolize Esau; "and there was evening," to symbolize Esau; "and there was morning," to symbolize Jacob. And "one day" teaches that God gave Israel one unique day over which darkness has no influence — the Day of Atonement. Rabbi Akiva taught that because says, "the tenth day of this seventh month is the Day of Atonement," and says, "It shall be to you a Sabbath," whenever Yom Kippur coincides with a Sabbath, whoever unwittingly performs work is liable for violating both Yom Kippur and the Sabbath. But Rabbi Ishmael said that such a person is liable on only a single count. Chapter 8 of tractate Yoma in the Mishnah and Babylonian Talmud and chapter 4 of tractate Kippurim (Yoma) in the Tosefta interpreted the laws of self-denial in and . The Mishnah taught that on Yom Kippur, one must not eat, drink, wash, anoint oneself, put on sandals, or have sexual intercourse. Rabbi Eliezer (whom the halachah follows) taught that a king or bride may wash the face, and a woman after childbirth may put on sandals. But the sages forbad doing so. The Tosefta taught that one must not put on even felt shoes. But the Tosefta taught that minors can do all these things except put on sandals, for appearance's sake. The Mishnah held a person culpable to punishment for eating an amount of food equal to a large date (with its pit included), or for drinking a mouthful of liquid. For the purpose of calculating the amount consumed, one combines all amounts of food together, and all amounts liquids together, but not amounts of foods together with amounts of liquids. The Mishnah obliged one who unknowingly or forgetfully ate and drank to bring only one sin-offering. But one who unknowingly or forgetfully ate and performed labor had to bring two sin-offerings. The Mishnah did not hold one culpable who ate foods unfit to eat, or drank liquids unfit to drink (like fish-brine). The Mishnah taught that one should not afflict children at all on Yom Kippur. In the two years before they become Bar or Bat Mitzvah, one should train children to become used to religious observances (for example by fasting for several