7 But as to Cain, he did not want to make an offering, but after his father became very angry, he offered up a gift once. He took the smallest of his sheep for an offering and when he offered it up, his eyes were on the lamb.
8 Therefore God did not accept his offering, because his heart was full of murderous thoughts.
9 And they all thus lived together in the cave in which Eve had brought forth, until Cain was fifteen years old, and Abel twelve years old.
Chapter LXXVIII - Jealousy overcomes Cain. He makes trouble in the family. How the first murder was planned.
1 Then Adam said to Eve, "Behold the children are grown up; we must think of finding wives for them."
2 Then Eve answered, "How can we do it?"
3 Then Adam said to her, "We will join Abel's sister in marriage to Cain, and Cain's sister to Abel.
4 The said Eve to Adam, "I do not like Cain because he is hard-hearted; but let them stay with us until we offer up to the Lord in their behalf."
5 And Adam said no more.