Deuteronomy 22:19
They must also make him pay a hundred shekels of silver. They must give the silver to the young woman's father. This is because the man gave a virgin of Israel a bad name. And she must stay his wife. He must never divorce her as long as he lives.
Deuteronomy 22:19, Readable English Bible (READ)
Note: A hundred shekels is about 2.5 pounds (1.1 kilograms) of silver.