He asked him, “Prince, why are you so dejected morning after morning? Why not tell me?” So Amnon said to him, “I am in love with Tamar, my brother Absalom’s sister.”
Then Jonadab replied, “Lie down on your bed and pretend to be sick. When your father comes to visit you, say to him, ‘Please let my sister Tamar come and encourage me to take food. If she prepares something in my presence, for me to see, I will eat it from her hand.’”
They have acted shamefully; they have done abominable things, yet they are not at all ashamed, they do not know how to blush. Hence they shall be among those who fall; in their time of punishment they shall stumble, says the Lord.
You shall not have intercourse with your sister, your father’s daughter or your mother’s daughter, whether she was born in your own household or born elsewhere.
If a man marries his sister, his father’s daughter or his mother’s daughter, and they have intercourse with each other, that is disgraceful; they shall be publicly cut off from the people; the man shall bear the penalty of having had intercourse with his own sister.