Genesis 4:5
5 but xfor Cain and his offering he had no regard. So Cain was very angry, and his face fell.
Genesis 4:8
8 Cain spoke to Abel his brother.1 And when they were in the field, Cain rose up against his brother Abel and akilled him.
1 John 3:12
12 We should not be like xCain, who was of the evil one and murdered his brother. And why did he murder him? yBecause his own deeds were evil and his brother’s righteous.