Wearing Tefillin during the period between a relative's death and burial [Aninut]
Verses in Tanach
Talmud / Midrash and commentaries
Berachot 17b-18a
Yerushalmi Berachot 3:1
Yerushalmi Moed Katan 3:5
Semachot 10:1
Bereishit Rabbah Noach:6; 100:7
Meiri Berachot 17b
Rashba Berachot 17b
Post Talmud / Midrash, Pre-Rishonim
Mishneh Torah and commentaries
Rishonim [Pre-"Code of Jewish Law"]
Tur, Shulchan Aruch ["Code of Jewish Law"] and Commentaries
Beit Yosef Orach Chaim 71 "Mi SheMeit"; Yoreh Deah 341 "Mi SheMeito"
Kitzur Shulchan Aruch 141:21
Acharonim [Post-"Code of Jewish Law"]
Recent Authorities
Gan Shoshanim [Rabbi Menachem Genack] 3
Yabia Omer 2: Yoreh Deah 27
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