Should one wear tallit gadol during the shachris on Shabbat if it is the 9 av (as in 2022)? On other shabbatot the person does wear a tallit.
I know that in this case the observance takes place on the next day. But still, the Shabbat is 9 av.
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One does not perform any outer acts of mourning during Shabbos, even if it's the ninth of Av (see Mishnah Berurah 552:23 and 553:6). The custom is those who normally wear a Tallis at Shacharis to refrain from wearing one when the fast of the ninth of Av is observed, as an act of mourning (see Tur Orach Chaim 555).
Consequently, if one usually wears a Tallis at Shacharis, they should continue to do when the ninth of Av occurs on Shabbos. Refraining would be forbidden, as that would be an outward act of mourning. Instead, the practices of the ninth of Av are delayed until the next day, including this custom regarding a Tallis.