And the priest shall take some of the log of oil,.... With his right hand, as the Targum of Jonathan adds:

and pour it into the palm of his own left hand: but in the original text it is, "pour it into the palm of the priest's left hand": and it is a question, whether he or another priest is meant; according to Aben Ezra, the oil was to be poured into the hand of the priest that was cleansing the leper, and which, he thinks, is plain from what follows; but Gersom thinks it is better to understand it of another priest, since it is not said into his own hand, but into the hand of the priest; and the Misnah (u) is clear for it, he (the priest) takes of the log of oil and pours it into the palm of his fellow (priest), but if he pours it into his own palm it is sufficient.

(u) Ib. sect. 10. so Maimon. Mechosre Capharah, ut supra, (c. 4. sect. 2.) & Bartenora, in Misn. Negaim, ib.

The priest then poured some oil out of the log into the hollow of his left hand, and dipping the finger of his right hand in the oil, sprinkled it seven times before Jehovah, i.e., before the altar of burnt-offering, to consecrate the oil to God, and sanctify it for further use. With the rest of the oil he smeared the same organs of the person to be consecrated which he had already smeared with blood, placing it, in fact, "upon the blood of the trespass-offering," i.e., upon the spots already touched with blood; he then poured the remainder upon the head of the person to be consecrated, and so made atonement for him before Jehovah. The priests were also anointed at their consecration, not only by the pouring of oil upon their head, but by the sprinkling of oil upon their garments (Leviticus 8:12, Leviticus 8:30). But in their case the anointing of their head preceded the consecration-offering, and holy anointing oil was used for the purpose. Here, on the contrary, it was ordinary oil, which the person to be consecrated had offered as a sacrificial gift; and this was first of all sanctified, therefore, by being sprinkled and poured upon the organs with which he was to serve the Lord, and then upon the head, which represented his personality. Just as the anointing oil, prepared according to divine directions, shadowed forth the power and gifts of the Spirit, with which God endowed the priests for their peculiar office in His kingdom; so the oil, which the leper about to be consecrated presented as a sacrifice out of his own resources, represented the spirit of life which he had received from God, and now possessed as his own. This property of his spirit was presented to the Lord by the priestly waving and sprinkling of the oil before Jehovah, to be pervaded and revived by His spirit of grace, and when so strengthened, to be not only applied to those organs of the person to be consecrated, with which he fulfilled the duties of his vocation as a member of the priestly nation of God, but also poured upon his head, to be fully appropriated to his person. And just as in the sacrifice the blood was the symbol of the soul, so in the anointing the oil was the symbol of the spirit. If, therefore, the soul was established in gracious fellowship with the Lord by being sprinkled with the atoning blood of sacrifice, the anointing with oil had reference to the spirit, which gives life to soul and body, and which was thereby endowed with the power of the Spirit of God. In this way the man cleansed from leprosy was reconciled to Jehovah, and reinstated in the covenant privileges and covenant grace.

And the priest shall take some of the log of oil, and pour it into the palm of his own left hand:

14:15 The oil - As the blood signified Christ's blood by which men obtained remission of sins, so the oil noted the graces of the spirit by which they are renewed.

14:10-32 The cleansed leper was to be presented to the Lord, with his offerings. When God has restored us to enjoy public worship again, after sickness, distance, or otherwise, we should testify our thanksgiving by our diligent use of the liberty. And both we and our offerings must be presented before the Lord, by the Priest that made us clean, even our Lord Jesus. Beside the usual rites of the trespass-offering, some of the blood, and some of the oil, was to be put upon him that was to be cleansed. Wherever the blood of Christ is applied for justification, the oil of the Spirit is applied for sanctification; these two cannot be separated. We have here the gracious provision the law made for poor lepers. The poor are as welcome to God's altar as the rich. But though a meaner sacrifice was accepted from the poor, yet the same ceremony was used for the rich; their souls are as precious, and Christ and his gospel are the same to both. Even for the poor one lamb was necessary. No sinner could be saved, had it not been for the Lamb that was slain, and hath redeemed us to God with his blood.