Halakha Imamat 16:1: Mishneh Torah, Marriage, Mishneh Torah, Prayer and the Priestly Blessing & Shulchan Arukh, Orach Chayim

All for whom intercourse is forbidden according to the Torah and is punished upon such intercourse with karet, and these are stated in the Torah portion Acharei Mot (Leviticus 16:1), are called Arayot and each one of them is called an Erva. For example, one's mother, sister, daughter, and similar.

The reader has (sometimes^*On the Day of Atonement.) to skip from passage to passage—both being on the same theme—as, for instance, that beginning, ".… After the death of the two sons of Aaron" (Leviticus chapter 16 verse 1) to that beginning, "And on the tenth day of this seventh month" (Numbers 29:7-11) which is in the weekly portion Emor. But he must take care not to recite by heart, it being forbidden to recite even a single word without referring to the text. Nor, when skipping, may he pause for a longer time than it takes the interpreter to translate the last verse [of the former passage].

On the Day of Atonement, in the morning service, the section read is that beginning, "After the death of the two sons of Aaron" (Leviticus 16:1-34); and the lesson from the Prophets is that beginning, "For thus saith the High and Lofty One" (Isaiah 57:15-58:14). In the afternoon service, the section read is that concerning Incests in the portion beginning, "After the death of the two sons of Aaron" (Leviticus Chapter 18). The purpose aimed at is that anyone who has been guilty of any of these offences should remember and be abashed. The third person called up reads in the Torah and recites, as the lesson from the Prophets, the book of Jonah.