Bereishit Rabbah 22:7. In Season 1 of More Midrash, Rabbi Jay Asher LeVine explores the midrashic collection on the book of Genesis, Bereishit Rabbah. The first midrash of the season peeks into the dynamics behind why Cain killed Abel. Read more: https://moremidrash.com/cain-and-abel-the-first-fight/