Deuteronomy 24:3-5

The Voice

³ and that second man also isn’t happy with her, and he writes her a certificate of divorce, gives it to her, and sends her away; or suppose that second man who married her dies. ⁴ In either case, the first man who divorced her isn’t allowed to take her back as his wife because the intimacy of the second marriage defiled her for her first husband. The Eternal would be horrified if anyone did this. It would bring sin on the land the Eternal your God is giving you to live in and pass down to your children.

⁵ When a man first gets married, he’s free from military service and any other civic duty for one year. He and his wife may spend that year happily together in their home.