Genesis 30:15-18

15But she said to her, “Wasn’t it enough that you took away my husband? Will you take my son’s mandrakes too?” “Very well,” Rachel said, “he can sleep with you tonight in return for your son’s mandrakes.”

16So when Jacob came in from the fields that evening, Leah went out to meet him. “You must sleep with me,” she said. “I have hired you with my son’s mandrakes.” So he slept with her that night. 17God listened to Leah, and she became pregnant and bore Jacob a fifth son.

18Then Leah said, “God has rewarded me for giving my servant to my husband.” So she named him Issachar. Issachar sounds like the Hebrew for reward.