Halakhah for Yoma 148:12
ונילף (בראשית לא, נ) מאם תענה את בנותי דנין ענוי דרבים מענוי דרבים ואין דנין ענוי דרבים מענוי דיחיד
the eating of which is commanded, therefore Scripture said: 'Ye shall afflict', 'and ye shall afflict your souls which is inclusive. I might then include terumah, which is not subject to the law concerning remaining over, but exclude holy sacrifices, in connection with which the law concerning remaining over applies, therefore the text reads: 'Ye shall afflict', 'and ye shall afflict your souls', which is inclusive.
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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