Genesis 29:25-26

But in the morning [when Jacob awoke], it was Leah [who was with him]! And he said to Laban, “What is this that you have done to me? Did I not work for you [for seven years] for Rachel? Why have you deceived and betrayed me [like this]?” But Laban only said, “It is not the tradition here to give the younger [daughter in marriage] before the older.