Leviticus 14 :3

The priest shall go forth out of the camp - As the leper was separated from the people, and obliged, because of his uncleanness, to dwell without the camp, and could not be admitted till the priest had declared that he was clean; hence it was necessary that the priest should go out and inspect him, and, if healed, offer for him the sacrifices required, in order to his re-admission to the camp. As the priest alone had authority to declare a person clean or unclean, it was necessary that the healed person should show himself to the priest, that he might make a declaration that he was clean and fit for civil and religious society, without which, in no case, could he be admitted; hence, when Christ cleansed the lepers, Matthew 8:2-4, he commanded them to go and show themselves to the priest, etc.

14:3 Healed by God - For God alone did heal or cleanse him really, the priest only declaratively.