“Kings and Priests” From Dictionary of Biblical Words:
Believers are made kings and priests unto God (Rev. 5:10, Peter 2, &c). Already they exercise the functions of priests in offering sacrifices to God (Heb. 13), and they will reign as kings with Christ. But if they have this high place toward God, in connection with the world, they are pilgrims and strangers.
“Priesthood of the Believer” From Dictionary of Biblical Words:
This is of two orders, answering somewhat to the double character of the High-priesthood. Believers are holy priests to offer up spiritual sacrifices, herein resembling the Aaronic order, and are also royal priests to show forth the virtues of Him who has called them out of darkness into His marvelous light (1 Peter 2), herein resembling the Melchizedek functions, which Christ will exercise hereafter. All believers, men and women, are priests, and are all responsible to offer up sacrifices, which are of three sorts—praise, almsgiving, (Heb. 13:15,16), and devotion (Rom. 12:1).
Concise Bible Dictionary:
It is remarkable that this title occurs but seldom in the Old Testament (Lev. 21:10; Num. 35:25; Josh. 20:6; 2 Kings 12:10; 2 Chron. 24:11, and others). Aaron was constantly called “the priest”; but as his sons were also called priests, he was necessarily the “chief” and would correspond to what is called high priest in the New Testament. His office is summed up in few words: he “is ordained for men in things pertaining to God” that he might offer both gifts and sacrifices for sins. He stood for the people to God: he offered up the sacrifices which put the people in relation with God (Lev. 9), also those on the day of atonement (Lev. 16), and he blessed them as from God. He, as taken from among men, was one who could have compassion on, or forbearance toward, the ignorant and the erring; for that he himself was compassed with infirmity (Heb. 5:1-2). Aaron did not take the honor upon himself, nor did Christ (Heb. 5:4-5). Having accomplished redemption by the offering of Himself, He passed through the heavens and sat down on the right hand of God. He is touched with the feeling of our infirmities, having been Himself tempted as we are, apart from sin. He ever lives to make intercession for us, He is also the minister of the sanctuary—He appears in the presence of God for us, and is the great Priest over the house of God (Heb. 4:14-15; Heb. 8:1). See AARON, AARONIC PRIESTHOOD, MELCHISEDEC.
Strong’s Dictionary of Greek Words:
Meaning:
from 2413; a priest (literally or figuratively)