Genesis 29:23-27

23And it came to pass in the evening, that he took Leah his daughter, and brought her to him; and he went in to her.

24And Laban gave to her Zilpah, his maidservant, to be maidservant to Leah his daughter.

25And it came to pass in the morning, that behold, it was Leah. And he said to Laban, What is this thou hast done to me? Have I not served thee for Rachel? Why then hast thou deceived me?

26And Laban said, It is not so done in our place, to give the younger before the firstborn.

27Fulfil the week [with] this one: then we will give thee the other one also, for the service that thou shalt serve me yet seven other years.