Genesis 30:15-17

Leah replied, “You already took away the affection of my husband, so now you’re going to take my son’s mandrakes, too?” Rachel said, “All right then, I’ll let him sleep with you tonight in exchange for some of your son’s mandrakes.” That evening, when Jacob was coming home from the field, Leah went out to meet him and said, “You must sleep with me tonight, for I’ve paid for your services with my son’s mandrakes.” So Jacob slept with Leah that night. God listened compassionately to Leah’s cry, she became pregnant, and bore Jacob a fifth son