Shulchan Arukh, Orach Chayim
4. It is permitted to read the entire Order of the Day (of prayers) - the paragraphs of the Sacrifices, the Mishnah (Chapter) of Eizu Mekoman, and the teaching of Rabbi Yishmael. Note (Rema): It is permitted to review the Torah reading (of Tisha B'av) on Tisha B'av.