Luke 5:14

But lest leprosy should become rife among us, let each avoid boasting after the example of our Lord's humility. For it follows, And he commanded him that he should tell it to no one, that in truth he might teach us that our good deeds are not to be made public, but to be rather concealed, that we should abstain not only from gaining money, but even favour. Or perhaps the cause of His commanding silence was that He thought those to be preferred, who had rather believed of their own accord than from the hope of benefit.

And that the Priest also should know that not by the order of the law, but by the grace of God above the law, he was cured. And since a sacrifice is commanded by the regulation of Moses, the Lord shows that He does not abrogate the law, but fulfil it. As it follows, And offer for thy cleansing according as Moses commanded.

Or because the law is spiritual He seems to have commanded a spiritual sacrifice. Hence he said, As Moses commanded. Lastly, he adds, for a testimony unto them. The heretics understand this erroneously, saying, that it was meant as a reproach to the law. But how would he order an offering for cleansing, according to Moses' commandments, if he meant this against the law?

(Hom. 26. in Matt.) And since frequently men, when they are sick, remember God, but when they recover, wax dull, He bids him to always keep God before his eyes, giving glory to God. Hence it follows, But go and show thyself to the Priest, in order that the leprous man being cleansed might submit himself to the inspection of the Priest, and so by his sanction be counted as healed. (ubi sup.) Or, for a testimony against them, i. e. as a reproof of them, and a testimony that I respect the law. For now too that I have cured thee, I send thee for the examination of the priests, that thou shouldest bear me witness that I have not played false to the law.

(de Qu. Ev. l. ii. qu. 3.) He seems here to approve of the sacrifice which had been commanded through Moses, though the Church does not require it. It may therefore be understood to have been commanded, because not as yet had commenced that most holy sacrifice which is His body. For it was not fitting that typical sacrifices should be taken away before that which was typified should be confirmed by the witness of the Apostles' preaching, and the faith of believers.