Firstly, I believe Apostle Paul is who wrote the Book of Hebrews, so that's why you'll read my writing with referencing Paul as the author. There are scholarly suggestions for this which I won't go into. I believe they are correct.
Hebrews 7 is actually pointing to our Lord Jesus Christ in Old Testament times as Melchisedec who met Abraham. One simply must pay attention when reading Hebrews 7 that points this out.
Heb 7:1-14
1 For this Melchisedec, king of Salem, priest of the most high God, who met Abraham returning from the slaughter of the kings, and blessed him;
2 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;
3 Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.
Right there in red are direct references to the divinity of God The Son. The only one born in the flesh that eternally had neither beginning nor end of days is our Lord Jesus Christ, one Person in The Godhead of the Father, Son, and Holy Spirit. And even that idea, "abideth a priest continually" is only about Lord Jesus Christ, and is a reference to the later Hebrews 7:17 verse, which is a direct quote from the Psalms 110:4 verse about Christ being forever a priest after the order of Melchizedek. And by the way, the definition of the title 'Melchizedek' is 'King of Righteousness'. There's only One of those, Jesus Christ.
4 Now consider how great this man was, unto whom even the patriarch Abraham gave the tenth of the spoils.
5 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:
6 But he whose descent is not counted from them received tithes of Abraham, and blessed him that had the promises.
7 And without all contradiction the less is blessed of the better.
8 And here men that die receive tithes; but there he receiveth them, of whom it is witnessed that he liveth.
9 And as I may so say, Levi also, who receiveth tithes, payed tithes in Abraham.
10 For he was yet in the loins of his father, when Melchisedec met him.
Paul is giving us how great this Melchisedec was that Abraham tithed to. And that happened even before the sons of Levi were even born! the law hadn't even been given through Moses yet when Abraham did that! Moses wasn't even born yet then! So what gives with this Melchisedec and Abraham giving tithes to him? Even more so, why would The Father point to Lord Jesus in Psalms 110:4 about being a priest forever after the order of Melchizedek, if Melchizedek were just some flesh king back in Abraham's day?
11 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 Melchisedec, and not be called after the order of Aaron?
12 For the priesthood being changed, there is made of necessity a change also of the law.
13 For He of Whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar.
14 For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.
KJV
Just Who Paul was talking about all along from verse 1 he reveals in that Hebrews 7:13-14 Scripture in red above. He was pointing to Lord Jesus Christ all along as Melchisedec Who met Abraham in Old Testament times, and offered Abraham "bread and wine" and blessed him. And at the end of John 8, Lord Jesus revealed that He spoke to Abraham back in Abraham's day, saying that Abraham rejoiced to see His day, and was glad.
Per Romans 4 and Galatians 3, Apostle Paul revealed that The Gospel of Jesus Christ was first preached to Abraham. And Abraham believed God, and his Faith was counted as righteousness. And thus those of Faith have become the 'children of Abraham', that is what Paul said. The Promise by Faith given first to Abraham from God is about The Gospel of Jesus Christ. And God gave that Promise by Faith 430 years before He gave the law through Moses. Thus no one can try to say The Gospel Salvation is about keeping the law, but only by Faith on the Blood of Jesus Christ, and not of works.
Why Melchizedek then? Because Jesus Christ has always... been our King, eternally. This is why this Hebrews 7 chapter starts out declaring Melchisedec without beginning or end of days, without mother or father. It is pointing to Christ Jesus, even though Jesus wasn't born through woman yet.
It is difficult for me understand how someone can claim Jesus of Nazareth as The Christ, and believe He has not always been Eternally part of The Godhead, but only manifested when He was born in the flesh through Mary.
Hebrews 7 is actually pointing to our Lord Jesus Christ in Old Testament times as Melchisedec who met Abraham. One simply must pay attention when reading Hebrews 7 that points this out.
Heb 7:1-14
1 For this Melchisedec, king of Salem, priest of the most high God, who met Abraham returning from the slaughter of the kings, and blessed him;
2 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;
3 Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.
Right there in red are direct references to the divinity of God The Son. The only one born in the flesh that eternally had neither beginning nor end of days is our Lord Jesus Christ, one Person in The Godhead of the Father, Son, and Holy Spirit. And even that idea, "abideth a priest continually" is only about Lord Jesus Christ, and is a reference to the later Hebrews 7:17 verse, which is a direct quote from the Psalms 110:4 verse about Christ being forever a priest after the order of Melchizedek. And by the way, the definition of the title 'Melchizedek' is 'King of Righteousness'. There's only One of those, Jesus Christ.
4 Now consider how great this man was, unto whom even the patriarch Abraham gave the tenth of the spoils.
5 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:
6 But he whose descent is not counted from them received tithes of Abraham, and blessed him that had the promises.
7 And without all contradiction the less is blessed of the better.
8 And here men that die receive tithes; but there he receiveth them, of whom it is witnessed that he liveth.
9 And as I may so say, Levi also, who receiveth tithes, payed tithes in Abraham.
10 For he was yet in the loins of his father, when Melchisedec met him.
Paul is giving us how great this Melchisedec was that Abraham tithed to. And that happened even before the sons of Levi were even born! the law hadn't even been given through Moses yet when Abraham did that! Moses wasn't even born yet then! So what gives with this Melchisedec and Abraham giving tithes to him? Even more so, why would The Father point to Lord Jesus in Psalms 110:4 about being a priest forever after the order of Melchizedek, if Melchizedek were just some flesh king back in Abraham's day?
11 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 Melchisedec, and not be called after the order of Aaron?
12 For the priesthood being changed, there is made of necessity a change also of the law.
13 For He of Whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar.
14 For it is evident that our Lord sprang out of Juda; of which tribe Moses spake nothing concerning priesthood.
KJV
Just Who Paul was talking about all along from verse 1 he reveals in that Hebrews 7:13-14 Scripture in red above. He was pointing to Lord Jesus Christ all along as Melchisedec Who met Abraham in Old Testament times, and offered Abraham "bread and wine" and blessed him. And at the end of John 8, Lord Jesus revealed that He spoke to Abraham back in Abraham's day, saying that Abraham rejoiced to see His day, and was glad.
Per Romans 4 and Galatians 3, Apostle Paul revealed that The Gospel of Jesus Christ was first preached to Abraham. And Abraham believed God, and his Faith was counted as righteousness. And thus those of Faith have become the 'children of Abraham', that is what Paul said. The Promise by Faith given first to Abraham from God is about The Gospel of Jesus Christ. And God gave that Promise by Faith 430 years before He gave the law through Moses. Thus no one can try to say The Gospel Salvation is about keeping the law, but only by Faith on the Blood of Jesus Christ, and not of works.
Why Melchizedek then? Because Jesus Christ has always... been our King, eternally. This is why this Hebrews 7 chapter starts out declaring Melchisedec without beginning or end of days, without mother or father. It is pointing to Christ Jesus, even though Jesus wasn't born through woman yet.
It is difficult for me understand how someone can claim Jesus of Nazareth as The Christ, and believe He has not always been Eternally part of The Godhead, but only manifested when He was born in the flesh through Mary.