Translation:Shulchan Aruch/Orach Chaim/282
282: The Reading of the Torah and the Maftir on Sabbath.
1 A Torah scroll is brought out and seven read from it. And if one wanted to add, one adds. Gloss: And this is also the law on a festival, it is permitted to add to the readers (Rambam, Chapter 12 of The Laws of Prayer; and Responsum of Maharam; and Beit Yosef). And there are those who say that on a festival one should not add (Ran, Chapter "HaKorei"). And thus they practiced in these countries, except for on Simchat Torah when we add many. Also on every Festival, the maftirs are not from the count of the readers, as below.
2 It is permitted to read for many being called up, even though this one read what this one has read and goes back and recites a blessing – there is nothing problematic with this. Gloss: And there are some who forbid (Mordekhai, end of Megillah). And so is the custom in these countries, except for on Simchat Torah when they practiced to multiply the readers and the custom is according to the first opinion.
3 All count towards the seven who are called up, even a woman and a child who knows for Whom we bless, but the Sages said: A woman shall not read in public, because of the honor of the community. Gloss: And these specifically may be included in those who read, but not that all of them should be women or children (Ra"n and Riva"sh). And the law of a Canaanite slave is as the law of a woman; but if his mother is Jewish, he may go up (Hagahot Maimoniyot, Chapter 12 of the laws of Prayer). And it is prohibited to read with an uncovered head. And there is no prohibition to call up a respected ignoramus, who is rich and the greatest of the generation, before learned men; for this is not disrespectful to the learned men, rather an honor to the Torah which is honored by great men (Ohr Zaru'a). And a mamzer may go up to the Torah scroll (Mahar"a of Prague). And see above, Siman 136, for the order of those who read.
4 It is customary to call up seven to complete the parshah with them. And he says Kaddish, and then goes back and reads with the maftir what the seventh one read. Gloss: And likewise is the custom on yomim tovim that the maftir is not from the amount of the readers. But during the week, when it is forbidden to add to the amount of readers, the third one is the maftir. And on a day where two or three scrolls are taken out, the maftir reads in the last one. And a minor could read in the additional parshah, or in the four parshiyot that are added in Adar, and such is the custom (Ra"n; and Mordechai, Chapter 2 of Megillah), even though there are those who disagree. And kaddish is said prior to the maftir being called up. And there is no difference in this whether if they added to the amount of those who are called or not, and whether one or three Torah scrolls are taken out (Beis Yosef in the name of Rabbi Yeshayah; and the Rosh; and Rabbi Yerucham).
5 If there is no one else present who knows how to read the haftarah aside from one of those who was called up to read in the Torah, and the sheliach tzibbur has already recited Kaddish after the reading of the portion, this one who wants to do maftir needs to go back and read and should recite a blessing on his reading, at the beginning and end. Gloss: But if he did not say kaddish, the one who was called up seventh should do maftir if he is knowledgeable. And if there are others who know how to do maftir, then one who was already called up should not do maftir. (Or Zarua). And see end of Siman 144.
6 If the sheliach tzibbur erred and completed the portion with the sixth and recited Kaddish, it is not necessary to call another one. But he should read with the maftir what he read with the sixth, for we have established that the maftir may be counted among the seven.
7 If he read the portion in the morning prayer on Shabbat, and he skipped one verse, he goes back and reads it together with two. Even if he read the haftarah and prayed the musaf service, he goes back and reads.