Genesis 4:1-2

The Story of Cain and Abel

4:1 Now the man had marital relations with his wife Eve, and she became pregnant and gave birth to Cain. Then she said, “I have created a man just as the Lord did!” 4:2 Then she gave birth to his brother Abel. Abel took care of the flocks, while Cain cultivated the ground.

Genesis 4:25

4:25 And Adam had marital relations with his wife again, and she gave birth to a son. She named him Seth, saying, “God has given me another child in place of Abel because Cain killed him.”