Leah answered, “You have already taken away my husband, and now you are trying to take away my son’s mandrakes.” But Rachel answered, “If you will give me your son’s mandrakes, you may sleep with Jacob tonight.”
“ ‘You must not have sexual relations with both a woman and her daughter. And do not have sexual relations with this woman’s granddaughter, either the daughter of her son or her daughter; they are her close relatives. It is evil to do this.
God made husbands and wives to become one body and one spirit for his purpose—so they would have children who are true to God. So be careful, and do not break your promise to the wife you married when you were young.