Genesis 30:15-19

But she said to her, “Is it a small matter for you to take my husband? And would you take my son’s mandrakes also?” So Rachel said, “Therefore he may sleep with you tonight in return for your son’s mandrakes.”

When Jacob came in from the field in the evening, Leah went out to meet him and said, “You must have relations with me, for I have indeed hired you with my son’s mandrakes.” So he slept with her that night.

God listened to Leah, and she conceived and bore Jacob a fifth son.

Then Leah said, “God has given me my reward, because I gave my slave to my husband.” So she named him Issachar.

And Leah conceived again and bore a sixth son to Jacob.