Now Adam slept with his wife, Eve, and she became pregnant. When the time came, she gave birth to Cain, and she said, "With the LORD's help, I have brought forth a man!"
References for Genesis 4:1
Later she gave birth to a second son and named him Abel.When they grew up, Abel became a shepherd, while Cain was a farmer.
At harvesttime Cain brought to the LORD a gift of his farm produce,
while Abel brought several choice lambs from the best of his flock. The LORD accepted Abel and his offering,
but he did not accept Cain and his offering. This made Cain very angry and dejected.
"Why are you so angry?" the LORD asked him. "Why do you look so dejected?
You will be accepted if you respond in the right way. But if you refuse to respond correctly, then watch out! Sin is waiting to attack and destroy you, and you must subdue it."
Later Cain suggested to his brother, Abel, "Let's go out into the fields." And while they were there, Cain attacked and killed his brother.
References for Genesis 4:8
Afterward the LORD asked Cain, "Where is your brother? Where is Abel?" "I don't know!" Cain retorted. "Am I supposed to keep track of him wherever he goes?"
But the LORD said, "What have you done? Listen -- your brother's blood cries out to me from the ground!
You are hereby banished from the ground you have defiled with your brother's blood.
No longer will it yield abundant crops for you, no matter how hard you work! From now on you will be a homeless fugitive on the earth, constantly wandering from place to place."
Cain replied to the LORD, "My punishment is too great for me to bear!
References for Genesis 4:13
You have banished me from my land and from your presence; you have made me a wandering fugitive. All who see me will try to kill me!"
The LORD replied, "They will not kill you, for I will give seven times your punishment to anyone who does." Then the LORD put a mark on Cain to warn anyone who might try to kill him.
So Cain left the LORD's presence and settled in the land of Nod, east of Eden.
References for Genesis 4:16