Genesis 4:6

As time passed, Cain brought an offering to the LORD from the fruit of the ground.

Abel also brought some of the firstborn of his flock and of its fat. The LORD respected Abel and his offering,

but he didn’t respect Cain and his offering. Cain was very angry, and the expression on his face fell.

If you do well, won’t it be lifted up? If you don’t do well, sin crouches at the door. Its desire is for you, but you are to rule over it.”

Cain said to Abel, his brother, “Let’s go into the field.” While they were in the field, Cain rose up against Abel, his brother, and killed him.

The LORD said to Cain, “Where is Abel, your brother?”

He said, “I don’t know. Am I my brother’s keeper?”