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

Genesis 30:14
Now during the wheat harvest, Reuben went out and found some mandrakes in the field. When he brought them to his mother, Rachel begged Leah, "Please give me some of your son's mandrakes."

Genesis 30:15
But Leah replied, "Is it not enough that you have taken away my husband? Now you want to take my son's mandrakes as well?" "Very well," said Rachel, "he may sleep with you tonight in exchange for your son's mandrakes."

Genesis 30:17
And God listened to Leah, and she conceived and bore a fifth son to Jacob.

And Jacob came out of the field in the evening, and Leah went out to meet him, and said, You must come in to me; for surely I have hired you with my son's mandrakes. And he lay with her that night.