Leviticus 14:16
And the priest shall dip his right finger in the oil that is in his left hand, and shall sprinkle of the oil with his finger seven times before the LORD: And the priest shall dip his right finger in the oil that is in his left hand, and shall sprinkle of the oil with his finger seven times before the LORD:
This law belongs to Moses, prescribing the priestly rites and the prescribed offering for a person cleansed of leprosy, including the priest's ceremony with oil. It stands within the larger ceremonial requirements of Leviticus 14:2-32 for cleansing a leper. Leprosy made a person unclean and cut off from family and the congregation of Israel.
The healed person was required to go to the priest, show himself for thorough examination, and be pronounced entirely free from the infectious disease and in sound health before the prescribed offering could be brought and accepted. The priest could not evade that examination and decision, nor accept the offering beforehand. That examination, certification, and prescribed ceremony with oil had to come first, and only then could the required offering be presented.
The priest's pronouncement and the prescribed offering allowed the restored person to reunite again with family, friends, and society without endangering them. Christ directed the healed leper to present himself to the priest and present the offering commanded by Moses, thereby honoring, upholding, respecting, and recognizing the authority of the law given through Moses. This showed false the charge that He opposed that law or the Jewish code. Keeping this command gave a testimony to priests and people and provided the priests with public, irrefutable evidence of the cure and of divine healing power in Christ.
The offerings and rites of this cleansing law were ceremonial types that met their antitype at Christ's death. The meaning of the oil-sprinkling action with the finger seven times itself is left unexplained.