Leviticus 14:30

And he shall offer the one of the turtledoves, or of the young pigeons, such as he can get;

The provision allows a person cleansed from leprosy to meet part of the required cleansing offering with one turtledove or young pigeon, according to what he can obtain. That requirement belongs to the law of Moses, the ceremonial law that governed Israel's religious life and ordered a cleansed leper's restoration through offerings brought to the priest. The offerings were sacred ordinances that explained and guarded the moral law.

The priest could not receive the offering until he had thoroughly examined the man, declared him entirely free from infectious disease and in sound health, and proclaimed it to the people, which permitted him to reunite safely with family and friends without endangering them. These were the same priests who had examined him and banished him from family and friends. This ceremonial system was given through Moses by Christ, who sanctioned its offerings, and it remained in force until His death, when the types met their fulfillment.

Christ directed the leper He had healed to show himself to the priest and present the offering Moses required, so his cure could be examined and formally recognized. That direction showed respect for the law given through Moses. It disproved the charge, made by the Pharisees, that His teaching opposed the law of Moses and the Jewish code and exalted Himself.

The priest's unprecedented certification of complete freedom from disease, followed by the man's joyful offering, gave public and irrefutable testimony to divine healing power and magnified Christ's name. It stirred great excitement in the waiting multitude anxious for the result. Although the priests still refused Him as Messiah, the testimony helped dispose them to consider His mission.