Please show us where David is a priest forever after the order of Melchizedek as per Psalms 110:4 B.
I find David will be a ' prince ' (Not a priest) according to Ezekiel 34:24. Isaiah 32:1; Psalms 45:16.
David to be resurrected back to life on Earth as ' prince ' because David is still asleep in the grave and did Not ascend as per Acts of the Apostles 2:34. David will be Prince under King Christ Jesus who is king of God's Kingdom for a thousand years according to 1 Corinthians 15:24-26.
Acts of the Apostles 24:15 applies to those like David who did Not ascend because the ' future tense ' is used that there ' is going to be ' a resurrection...... That future resurrection (Revelation 1:18) is to take place during Jesus' 1,000-year governmental rule over Earth.
Psa 110:4 YHVH hath sworn, and will not repent,
Thou art a priest for ever after the order of Melchizedek.
2Sa 7:16 And
thine house and thy kingdom shall be established for ever before thee:
thy throne shall be established for ever.
2Sa 7:17 According to all these words, and according to all this vision,
so did Nathan speak unto David.
*
2Sa 6:12 And it was told
king David, saying, YHVH hath blessed the house of Obededom, and all that
pertaineth unto him, because of the ark of God. So David went and brought up the ark of God from the house of Obededom into the city of David with gladness.
2Sa 6:13 And it was
so, that when they that bare the ark of YHVH had gone six paces,
he sacrificed oxen and fatlings.
2Sa 6:14 And David danced before YHVH with all
his might; and
David was girded with a linen ephod.
2Sa 6:15 So David and all the house of Israel brought up the ark of YHVH with shouting, and with the sound of the trumpet.
2Sa 6:16 And as the ark of YHVH came into the city of David, Michal Saul's daughter looked through a window, and saw king David leaping and dancing before YHVH; and she despised him in her heart.
2Sa 6:17 And they brought in the ark of YHVH, and set it in his place, in the midst of the tabernacle that David had pitched for it: and
David offered burnt offerings and peace offerings before the LORD.
2Sa 6:18 And as soon as
David had made an end
of offering burnt offerings and peace offerings,
he blessed the people in the name of the LORD of hosts.
David communicates with God wearing the Priest's Ephod - He blesses the people = a Priest King.
23:9 When David realized that Saul was planning to harm him, he told Abiathar the priest,
“Bring the ephod!”
23:10 Then David said, “O YHVH God of Israel, your servant has clearly heard that Saul is planning to come to Keilah to destroy the city because of me.
According to Tanakh some of His sons were also priests. 2 Samuel 8:18
David and his sons were not Levites, - they were special people brought into the priesthood, as was Melchizedek.
"A priest after the manner of Melchizedek does not refer to Jesus taking over the Levitical priesthood forever.2
This statement also refers to King David.
Melchizedek was non-Jewish a King who lived during the times of Abraham as it says:
“And Melchizedek King of Salem brought forth bread and wine and he was a priest (Kohen) of G-d the most high” Genesis 14:18
Even thought he was not Jewish and could not be from the tribe of Levy, he is called a priest (Kohen) because of his position of service. Similarly, Jethro (Moses’ father-in-law) was called a “priest (Kohen) of Midian.” Exodus 18:1
Melchizedek was called the “King of Salem” This mean that he was a king of Jerusalem. ...
"
"Additionally, the name Melchizedek comes from two Hebrew words, ‘melech’ which means king, and ‘zedek’ which means righteousness. This means a king over a place known for its righteousness.
Jerusalem is referred to as the city that reflects God’s righteousness as it is stated:
“Jerusalem will dwell in security and this is what she (Jerusalem) will be called ‘God is our righteousness.’” Jeremiah 33:16
Melchizedek, a generic title conferred of kings who rule over Jerusalem. In the same way, all kings of Egypt were called Pharaoh, Kings of Philistine were referred as Abimelech and Kings of Persia were given the title Achasverous.
So too, kings with the name ‘zedek’ as part of their title were human kings of Jerusalem as in:
“Adonizedek, king of Jerusalem” Joshua 10:l...
"
"Just as Melchizedek was king of Jerusalem so was David.
David was also promised that he would be a “priest forever after the manner of Melchizedek.” How could he be called a (Kohen) priest?
As noted above, the term priest is not exclusively used to refer to priest “Kohanin” who originated from the tribe of Levy.
In the Tanach the title Cohen is also used to refer to individuals dedicated to minister a specific service. ...
"
"We see specifically that David’s sons were referred to as “priests -Kohaim” as in:
“the sons of David were ministers (Kohanim) of state” 2 Samuel 8:18
Therefore, the term priest as in “priest of G-d, the most high” in Psalm 110:14 can also refer to a leader.
That David would be a “priest forever after the manner of Melchizedek.” means that the privilege of being ruler of Jerusalem would always remain to David and his descendants forever.
“To David and his offspring, forever” Psalm 18:51
The entire psalm speaks in the third person of King David and his relationship with G-d. He was literally a Melchizedek “king of righteousness” King of Jerusalem. ...
" Rabbi Bentzion Kravitz
https://jewsforjudaism.org/knowledge/articles/answers/jewish-polemics/texts/psalm-110-a-jewish-perspective/