Genesis 4:17, 25-26

He had sexual relations with his wife, and she became pregnant and gave birth to Enoch. At that time Cain was building a city, which he named after his son Enoch.

Adam had sexual relations with his wife Eve again, and she gave birth to a son. She named him Seth and said, “God has given me another child. He will take the place of Abel, who was killed by Cain.” Seth also had a son, and they named him Enosh. At that time people began to pray to the LORD.