Genesis 4:1-3, 5-18

Now the man had relations with his wife Eve, and she conceived and gave birth to Cain, and she said, “I have gotten a manchild with the help of the LORD.” Again, she gave birth to his brother Abel. And Abel was a keeper of flocks, but Cain was a tiller of the ground. So it came about in the course of time that Cain brought an offering to the LORD of the fruit of the ground.

but for Cain and for his offering He had no regard. So Cain became very angry and his countenance fell. Then the LORD said to Cain, “Why are you angry? And why has your countenance fallen? If you do well, will not your countenance be lifted up? And if you do not do well, sin is crouching at the door; and its desire is for you, but you must master it.” Cain told Abel his brother. And it came about when they were in the field, that Cain rose up against Abel his brother and killed him. Then the LORD said to Cain, “Where is Abel your brother?” And he said, “I do not know. Am I my brother’s keeper?” He said, “What have you done? The voice of your brother’s blood is crying to Me from the ground. Now you are cursed from the ground, which has opened its mouth to receive your brother’s blood from your hand. When you cultivate the ground, it will no longer yield its strength to you; you will be a vagrant and a wanderer on the earth.” Cain said to the LORD, “My punishment is too great to bear! Behold, You have driven me this day from the face of the ground; and from Your face I will be hidden, and I will be a vagrant and a wanderer on the earth, and whoever finds me will kill me.” So the LORD said to him, “Therefore whoever kills Cain, vengeance will be taken on him sevenfold.” And the LORD appointed a sign for Cain, so that no one finding him would slay him. Then Cain went out from the presence of the LORD, and settled in the land of Nod, east of Eden. Cain had relations with his wife and she conceived, and gave birth to Enoch; and he built a city, and called the name of the city Enoch, after the name of his son. Now to Enoch was born Irad, and Irad became the father of Mehujael, and Mehujael became the father of Methushael, and Methushael became the father of Lamech.