Leviticus 14:14

Taking of the blood, &c. These ceremonies, used in the cleansing of a leper, were mysterious and very significative. The sprinkling seven times with the blood of the little bird, the washing himself and his clothes, the shaving his hair and his beard, signify the means which are to be used in the reconciliation of a sinner, and the steps by which he is to return to God, viz. by the repeated application of the blood of Christ; the washing his conscience with the waters of compunction; and retrenching all vanities and superfluities, by employing all that is over and above what is necessary in alms deeds. The sin-offering, and the holocaust or burnt-offering, which he was to offer at his cleansing, signify the sacrifice of a contrite and humble heart, and that of adoration in spirit and truth, with gratitude and thankfulness, for the forgiveness of sins, with which we are ever to appear before the Almighty. The touching the right ear, the thumb of the right hand, and the great toe of the right foot, first with the blood of the victim, and then with the remainder of the oil, which had been sprinkled seven times before the Lord, signify the application of the blood of Christ, and the unction of the sevenfold grace of the Holy Ghost to the sinner's right ear, that he may duly hearken to and obey the law of God; and to his right hand and foot, that the works of his hands, and all the steps or affections of his soul, signified by the feet, may be rightly directed to God. (Challoner) See chap. viii. 23. --- These ceremonies might serve to call to the leper's recollection the benefit which he had received, and to distinguish him from others. (Calmet)