Halakhah for Yoma 148:5
אביא פגול ונותר שהן בכרת ולא אביא את הטבל שאינו בכרת ת"ל תענו ועניתם את נפשותיכם ריבה
- It is as with labour: Just as you have made no distinction with regard to labour, so in connection with the [prescribed] affliction<span class="x" onmousemove="('comment',' Labour, in any form, is prohibited. Just as one is not obliged to engage in positive work of affliction, the negative form of abstention from getting comfort. Hence, just as one need not go out of comfortable shade into the sun for the purpose of afflicting oneself, so need one not abstain from a change into shade in order to be afflicted in the sun.');"><sup>5</sup></span> is no distinction to be made.
Sefer HaChinukh
The commandment of the fast on the tenth day of Tishrei: To fast on the tenth day of Tishrei, and this is called The Day of Atonements (Yom HaKippurim), as it is stated (Leviticus 23:27), "But on the tenth of the month, etc. you shall afflict your souls." The explanation appears is Sifra, Achrei Mot, Chapter 7:3): "[This refers to] affliction that causes a diminishing of the soul. What is this? This is eating and drinking." And so [too,] did they, may their memory be blessed, explain in the Gemara (Yoma 74b). And the tradition also came about it, that it is forbidden for washing, anointing, wearing shoes, and sexual relations. And the language of Sifra, Parshat Achrei Mot, Chapter 8:3 is "From where [do we know] that Yom Kippur is forbidden for washing, anointing, [wearing shoes] and sexual relations? [Hence] we learn to say (Leviticus 23:32), 'A Shabbat of shabbaton'" - meaning that the doubling of Shabbat (rest) indicates resting from these things [as well as] resting from nourishment of the body.
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