Genesis 4 (NIV), bible , online Bible

4 Adam^[a] made love to his wife Eve, and she became pregnant and gave birth to Cain.^[b] She said, “With the help of the Lord I have brought forth^[c] a man.” ² Later she gave birth to his brother Abel.

Now Abel kept flocks, and Cain worked the soil. ³ In the course of time Cain brought some of the fruits of the soil as an offering to the Lord. ⁴ And Abel also brought an offering—fat portions from some of the firstborn of his flock. The Lord looked with favor on Abel and his offering, ⁵ but on Cain and his offering he did not look with favor. So Cain was very angry, and his face was downcast.
⁶ Then the Lord said to Cain, “Why are you angry? Why is your face downcast? ⁷ If you do what is right, will you not be accepted? But if you do not do what is right, sin is crouching at your door; it desires to have you, but you must rule over it.”
⁸ Now Cain said to his brother Abel, “Let’s go out to the field.”^[d] While they were in the field, Cain attacked his brother Abel and killed him.
⁹ Then the Lord said to Cain, “Where is your brother Abel?”
“I don’t know,” he replied. “Am I my brother’s keeper?”
¹⁰ The Lord said, “What have you done? Listen! Your brother’s blood cries out to me from the ground. ¹¹ Now you are under a curse and driven from the ground, which opened its mouth to receive your brother’s blood from your hand. ¹² When you work the ground, it will no longer yield its crops for you. You will be a restless wanderer on the earth.”
¹³ Cain said to the Lord, “My punishment is more than I can bear. ¹⁴ Today you are driving me from the land, and I will be hidden from your presence; I will be a restless wanderer on the earth, and whoever finds me will kill me.”
¹⁵ But the Lord said to him, “Not so^[e]; anyone who kills Cain will suffer vengeance seven times over.” Then the Lord put a mark on Cain so that no one who found him would kill him. ¹⁶ So Cain went out from the Lord’s presence and lived in the land of Nod,^[f] east of Eden.
¹⁷ Cain made love to his wife, and she became pregnant and gave birth to Enoch. Cain was then building a city, and he named it after his son Enoch. ¹⁸ To Enoch was born Irad, and Irad was the father of Mehujael, and Mehujael was the father of Methushael, and Methushael was the father of Lamech.
¹⁹ Lamech married two women, one named Adah and the other Zillah. ²⁰ Adah gave birth to Jabal; he was the father of those who live in tents and raise livestock. ²¹ His brother’s name was Jubal; he was the father of all who play stringed instruments and pipes. ²² Zillah also had a son, Tubal-Cain, who forged all kinds of tools out of^[g] bronze and iron. Tubal-Cain’s sister was Naamah.
²³ Lamech said to his wives,

“Adah and Zillah, listen to me;
    wives of Lamech, hear my words.
I have killed a man for wounding me,
    a young man for injuring me.
²⁴ If Cain is avenged seven times,
    then Lamech seventy-seven times.”

²⁵ Adam made love to his wife again, and she gave birth to a son and named him Seth,^[h] saying, “God has granted me another child in place of Abel, since Cain killed him.” ²⁶ Seth also had a son, and he named him Enosh.

At that time people began to call on^[i] the name of the Lord.