Before Jesus Christ, no one man was ever anointed as prophet, priest and king. Some were anointed prophets, some priests, and some kings; but in Him, all these offices are combined.
Prophet to all Mankind:
God, who at various times and in various ways spoke in time past to the fathers by the prophets, 2 has in these last days spoken to us by His Son, whom He has appointed heir of all things, through whom also He made the worlds. Hebrews 1:1-2 NKJV
God speaks to us through Jesus. Every word he speaks, we can fully depend on.
High Priest to all Humanity:
Therefore, holy brethren, partakers of the heavenly calling, consider the Apostle and High Priest of our confession, Christ Jesus, 2 who was faithful to Him who appointed Him, as Moses also was faithful in all His house. Hebrews 3:1-2 NKJV
Seeing then that we have a great High Priest who has passed through the heavens, Jesus the Son of God, let us hold fast our confession. 15 For we do not have a High Priest who cannot sympathize with our weaknesses, but was in all points tempted as we are, yet without sin. 16 Let us therefore come boldly to the throne of grace, that we may obtain mercy and find grace to help in time of need. Hebrews 4:14-16 NKJV
As He says also in another place, You are a Priest [appointed] forever after the order (with the rank) of Melchizedek. Hebrews 5:6 AMP
Where Jesus has entered in for us [in advance], a Forerunner having become a High Priest forever after the order (with the rank) of Melchizedek. Hebrews 6:20 AMP
Therefore, if perfection were through the Levitical priesthood (for under it the people received the law), what further need was there that another priest should rise according to the order of Melchizedek, and not be called according to the order of Aaron? 12 For the priesthood being changed, of necessity there is also a change of the law. 13 For He of whom these things are spoken belongs to another tribe, from which no man has officiated at the altar. 14 For it is evident that our Lord arose from Judah, of which tribe Moses spoke nothing concerning priesthood. 15 And it is yet far more evident if, in the likeness of Melchizedek, there arises another priest 16 who has come, not according to the law of a fleshly commandment, but according to the power of an endless life. 17 For He testifies: “You are a priest forever According to the order of Melchizedek.” Hebrews 7:11-17 NKJV
Jesus is our High Priest. He is the mediator between God and man and, at the same time, He was our sacrifice, purging us of all sin and stain. Because He stood in our place, we can have boldness to come into the presence of the Father with a sense of forgiveness and righteousness instead of a sense of sin or unworthiness.
King of all Nations:
I saw in the night visions, and behold, on the clouds of the heavens came One like a Son of man, and He came to the Ancient of Days and was presented before Him. 14 And there was given Him [the Messiah] dominion and glory and kingdom, that all peoples, nations, and languages should serve Him. His dominion is an everlasting dominion which shall not pass away, and His kingdom is one which shall not be destroyed. Daniel 7:13-14 AMP
For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace. 7 Of the increase of his government and peace there shall be no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever. The zeal of the Lord of hosts will perform this. Isaiah 9:6-7 KJV
And the Lord shall be king over all the earth: in that day shall there be one Lord, and his name one. Zechariah 14:9 KJV
He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David: 33 And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end. Luke 1:32-33 KJV
When the Son of Man comes in His glory, and all the holy angels with Him, then He will sit on the throne of His glory. Matthew 25:31 NKJV
Then the seventh angel sounded: And there were loud voices in heaven, saying, “The kingdoms of this world have become the kingdoms of our Lord and of His Christ, and He shall reign forever and ever!” Revelation 11:15 NKJV
And there shall be no more curse, but the throne of God and of the Lamb shall be in it, and His servants shall serve Him. 4 They shall see His face, and His name shall be on their foreheads. 5 There shall be no night there: They need no lamp nor light of the sun, for the Lord God gives them light. And they shall reign forever and ever. Revelation 22:3-5 NKJV
The kingdoms of this world have become the kingdoms of our Lord and of His Christ, and He shall reign forever and ever!