I. The reason of his being styled a Priest, which denomination was taken from those who exercised the priestly office under the ceremonial law, who were types of him, as such: accordingly we may consider; that the office of the priesthood was executed by sundry persons, appointed to this service. A priest was a public minister, who was to serve at the altar, _to offer both gifts and sacrifices for sins_, Heb. v. 1. That these were offered in all the ages of the church, after the fall of man, appears, from the sacrifice that Abel offered, which the apostle calls an _excellent one_, and, upon this occasion, says, that _he obtained witness that he was righteous, God testifying of his gifts_, Heb. xi. 4. and therefore it follows, that it was instituted by him: yet it does not appear that there was, in that early age of the church, a set of men solemnly and publickly invested in this office: but the heads of families are generally supposed to have been the public ministers in holy things, and particularly priests, though they do not appear to have been then so styled; and thus it continued till about the time that God brought Israel out of Egypt, when, by his appointment, all the first-born of the children of Israel were consecrated to him; and these officiated as priests, during that small interval of time, till the priesthood was settled in the tribe of Levi, upon which occasion God says, _I have taken the Levites from among the children of Israel, instead of all the first-born, because all the first-born are mine; for on the day that I smote all the first-born, in the land of Egypt, I hallowed unto me all the first-born in Israel_, Numb. iii. 12, 13. And, when God gave the ceremonial law from mount Sinai, he appointed that tribe to minister as priests in holy things. Of these some had one part of the ministry of the sanctuary committed to them, and others another; particularly the priesthood, or the charge of offering gifts and sacrifices, was more, especially committed to the family of Aaron, of which the eldest son, in their respective generations, was generally advanced to the high priesthood, and other descendants from him were common priests, who acted under, or were assistants to him in all the parts of his ministry, excepting that which respected his entering into the holy of holies. These were invested in their respective offices by unction, though the high priest’s office and unction had some things peculiar in it, in which it exceeded theirs; and they were all types of Christ’s priesthood, though the high priest was so in an eminent degree; which leads us to consider,