Yosef Karo, Translation:Shulchan Aruch — Orach Chaim 584…
“ Shulchan Aruch Orach Chaim 584 Torah Reading for Rosh Hashanah סדר קריאת התורה בראש השנה: 584:1 We do not say Hallel on Rosh Hashanah or Yom Kippur. Rem"a: We have the practice of saying all of "Our Father our King." If it is Shabbat, we do not say it (Ra"n chapter 2 of Rosh Hashanah and Rivas"h chapter 512) . We continue with piyyut and prayers until noon (Mahari"l) . ”
