And Laban said, "It must not be done so in our country, to give the younger before the firstborn.
Genesis 29:26
Surrounding context
29:25 So it came to pass in the morning, that behold, it was Leah. And he said to Laban, "What is this you have done to me? Was it not for Rachel that I served you? Why then have you deceived me?"
29:26 And Laban said, "It must not be done so in our country, to give the younger before the firstborn.
29:27 Fulfill her week, and we will give you this one also for the service which you will serve with me still another seven years."