Ezekiel 44:15

But the priests the Levites, the sons of Zadok;.... The priests who were of the tribe of Levi, whom the Lord chose and separated, to minister to him, and so had a lawful call to this office, and were regularly invested with it; and design true and lawful, as well as faithful, ministers of the word; these are called the sons of Zadok, who descended from Eleazar the son of Aaron in the line of Phinehas, to whom the Lord promised the everlasting priesthood, and who was put into this office by Solomon in the room of Abiathar, 1 Kings 2:35, his name signifies "righteous", and was a type of Christ; who, as a divine Person, is essentially righteous; as man, truly and perfectly so; and, as Mediator, God's righteous servant; and who, by his obedience and sufferings, is the author of righteousness to his people; who are his spiritual seed and offspring; children given him of his Father; who have his sonship and adoption through him, and are born of him, his Spirit, and grace; and these are made righteous by him, through his righteousness imputed to them, and may be rightly called sons of Zadok: and this agrees with all the saints; and who, under the Gospel dispensation, are all priests, and offer up themselves, souls and bodies, and their spiritual sacrifices of prayer and praise, unto God by Christ; though all have not a right to preach the word, and administer ordinances, as ministers lawfully called have, and who seem to be more particularly designed here; and such as are regenerated persons, and justified by Christ's righteousness, and preach the doctrine of free justification by it, are the only fit persons for such an office:

that kept the charge of my sanctuary, when the children of Israel went astray from me; that kept and held fast the pure doctrines of the Gospel, committed as a sacred depositum to them, without mixture, and without wavering, with courage and valour; though a greater number were on the other side, and though they were reproached and persecuted for it; and who taught the people to keep the ordinances of the Gospel as they were first delivered, in faith and love, and without sinister ends, and so administered them themselves; and such faithful ministers and members of churches, especially in a time of great declension and general defection, God takes notice of, and has promised them great and good things; see Revelation 2:7

they shall come near to me to minister unto me; in holy things to his people, which is called ministering unto him; as to pray to him for them; lo preach to them in his name, and administer ordinances: all the saints indeed are priests, and may draw nigh to God through Christ; men are at a distance from him, through sin; there is no coming near to him but by Christ; and this coming near is not local, but spiritual, and includes all acts of worship, particularly prayer; and is a great favour and blessing:

and they shall stand before me, to offer unto me the fat and the blood, saith the Lord God; which, under the law, were both the Lord's; the one was burnt, and the other sprinkled, on divers things, and in various places: here it may respect the administration of the ordinance of the Lord's supper, that feast of fat things, and which may be eminently called the goodness and fatness of the house of God; and in which the blood of Christ is represented as shed for the remission of sins, and as spiritual drink indeed to believers; and the sacrifice of Christ is commemorated, the feast being kept in remembrance of that.