Cain

CAIN

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The fact was correct that he offered plant-based foods to God while Abel offered meat to God. Cain didn’t offer at the right TIME when he should have.
God accepted Abel’s offering because of first fruits (first gift from God) while Cain offered the latter part of God’s gifts to him. It’s like saying “Thank you” one year later instead of immediately upon receiving the first gift. So God did not reject Cain’s offering because of the plant-based foods instead of meat. It was the TIMING of the offering to God that was important.

I thougt that it was "Kain and Abel". Cain with K, if you understand.