1. Suppose a man gets married to a woman. But later he decides he doesn't like her. He finds something shameful about her. So he gives her a letter of divorce and sends her away from his house.
2. Then after she leaves his house she becomes another man's wife.
3. But her second husband doesn't like her either. So he gives her a letter of divorce and sends her away from his house. Or perhaps he dies.
4. Then her first husband isn't allowed to marry her again. The Lord would hate that. When her first husband divorced her, she became "unclean." Don't bring sin on the land the Lord your God is giving you as your own.
5. Suppose a man has just gotten married. Then don't send him into battle. Don't give him any other duty either. He's free to stay home for one year. He needs time to make his new wife happy.