May 21, 2020 (Kitzur: The Grudge) References

Tanakh
Leviticus 19:18
Deuteronomy 2:4
Deuteronomy 10:19
Deuteronomy 13:1
Ezekiel 18
Proverbs 4:14-19
Proverbs 19:11
Proverbs 23:9
Proverbs 24:1-2
Proverb 25:21-22

Halakha
Mishneh Torah: Hilkhot T’shuvah, Chapter 2:11

Talmud
Yoma 23a

Kitzur Shulchan Arukh
Chapter 30: The Prohibition Against Talebearing, Slander, Vengeance, and Bearing a Grudge