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That part was from the Midrash Rabbah, it's basically a collection of really old writings of Jewish Rabbi. Some of it is from their oral traditions, the rest is more like a commentary on the Torah. I don't treat it like as highly as the Jews do, but it is interesting seeing how they interpreted scripture thousands of years ago. Then you have the oral traditions sprinkled in adding a little food for thought.

BTW this site is awesome for reading those. https://www.sefaria.org/