1 For this Melchizedek, king of Salem, priest of the most high God, who met Abraham returning from the slaughter of the kings, and blessed him;  To whom also Abraham gave a tenth part of all; first being by interpretation King of righteousness, and after that also King of Salem, which is, King of peace;  For this Melchizedek was ordained a priest after the order of the Son of God, which order was without father, without mother, without descent, having neither beginning of days, nor end of life. And all those who are ordained unto this priesthood are made like unto the Son of God, abiding a priest continually.  Now consider how great this man was, unto whom even the patriarch Abraham gave the tenth of the spoils.  And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law, that is, of their brethren, though they come out of the loins of Abraham;  But he whose descent is not counted from them received tithes of Abraham, and blessed him that had the promises.  And without all contradiction the less is blessed of the better.  And here men that die receive tithes; but there he receiveth them, of whom it is witnessed that he liveth.  And as I may so say, Levi also, who receiveth tithes, paid tithes in Abraham.  For he was yet in the loins of his father, when Melchizedek met him.  If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchizedek, and not be called after the order of Aaron?  For the priesthood being changed, there is made of necessity a change also of the law.   For he of whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar.  For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.  And it is yet far more evident; for that after the similitude of Melchizedek there ariseth another priest,  Who is made, not after the law of a carnal commandment, but after the power of an endless life.  For he testifieth, Thou art a priest forever after the order of Melchizedek.  For there is verily a disannulling of the commandment going before, for the weakness and unprofitableness thereof.  For the law was administered without an oath and made nothing perfect, but was only the bringing in of a better hope; by the which we draw nigh unto God.  Inasmuch as this high priest was not without an oath, by so much was Jesus made the surety of a better testament.  (For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest forever after the order of Melchizedek;)  And they truly were many priests, because they were not suffered to continue by reason of death;  But this man, because he continueth ever, hath an unchangeable priesthood.  Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them.  For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made ruler over the heavens;  And not as those high priests who offered up sacrifice daily, first for their own sins, and then for the sins of the people; for he needeth not offer sacrifice for his own sins, for he knew no sins; but for the sins of the people. And this he did once, when he offered up himself.   For the law maketh men high priests which have infirmity; but the word of the oath, which was since the law, maketh the Son, who is consecrated forevermore.  Hebrews 7

Now of the things which we have spoken this is the sum; we have such a high priest, who is set on the right hand of the throne of the Majesty in the heavens;  A minister of the sanctuary, and of the true tabernacle, which the Lord pitched, and not man.  For every high priest is ordained to offer gifts and sacrifices; wherefore it is of necessity that this man have somewhat also to offer.  Therefore while he was on the earth, he offered for a sacrifice his own life for the sins of the people. Now every priest under the law, must needs offer gifts, or sacrifices, according to the law.  Who serve unto the example and shadow of heavenly things, as Moses was admonished of God when he was about to make the tabernacle; for, See, saith he, that thou make all things according to the pattern showed to thee in the mount.  But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.  For if that first covenant had been faultless, then should no place have been sought for the second.  For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah;  Not according to the covenant that I made with their fathers, in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord.  For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts; and I will be to them a God, and they shall be to me a people;  And they shall not teach every man his neighbor, and every man his brother, saying, Know the Lord; for all shall know me, from the least to the greatest.   For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.  In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.  Hebrews 8