Cruelty
Verses in Tanach
Ohr haChaim Devarim 13:18
Talmud / Midrash and commentaries
Bava Metzia 85a
Pirkei deR' Eliezer 34 - Chopping down a tree
Post Talmud / Midrash, Pre-Rishonim
Mishneh Torah and commentaries
Rishonim [Pre-"Code of Jewish Law"]
Tur, Shulchan Aruch ["Code of Jewish Law"] and Commentaries
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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