Prayers between Rosh HaShanah and Yom Kippur
Verses in Tanach
Talmud / Midrash and Commentaries
Berachot 12b - Changes in the Amidah
Rosh haShanah 17b-18a - The 13 Attributes of Mercy, Availability between Rosh haShanah and Yom Kippur
Yevamot 105a - The acceptance of prayer during the 10 days of Repentance
Rabbeinu Yonah Berachot 6b in Dapei Rif, s.v. veAsikna - Repeating for omission of these prayers
Tosafot Megilah 31b s.v. Rosh
Post Talmud / Midrash, Pre-Rishonim
Mishneh Torah and commentaries
Rishonim [Pre-"Code of Jewish Law"]
Mahari Weil 191
Ri MiGash 182
Tur, Shulchan Aruch ["Code of Jewish Law"] and Commentaries
Mishnah Berurah 603:1-2
Shulchan Aruch Orach Chaim 603:1
Tur Orach Chaim 114, 115, 119, 582
Acharonim [Post-"Code of Jewish Law"]
Recent Authorities
To add sources or to suggest topics for source material, please e-mail me [Mordechai Torczyner] at: 
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