The law gave instructions for restoring purity after unavoidable contact with a dead body. Contact with a dead body made a person ceremonially unclean (not fit for worship for a period of time). The person had to follow certain steps in order to be restored.
Special procedures and offerings also marked the end of a Nazirite vow. A Nazirite vow was a special promise to set oneself apart for God for a period of time. When the time ended, the person brought sacrifices and completed the required rituals.
The law also gives a strong warning about fulfilling the vow (6:21). A person who made such a promise had to complete it fully. God expected faithfulness in keeping vows made to him.