“And when he saw them, he said unto them, Go shew yourselves unto the priests. And it came to pass, that, as they went, they were cleansed.”
King James Version (KJV)
Lu 17:14 Go shew yourselves. To be officially pronounced clean, a certificate had to be obtained from the priests (see PNT "Mt 8:4"). They were cleansed. As they went, an act of faith, they were healed. Not one would have been healed if he had disobeyed.