Psalm 125 :2  As the mountains surround Jerusalem, so The Lord surrounds His people."   Jerusalem is the beautiful city, the city of David and the city of God, the place where He chose to put His Name.
It is surrounded by mountains.  Mt Moriah, where Abraham offered Isaac, where Solomon built the temple, is most prominent. On one of these mountains Jesus was transfigured.  On one He was crucified. As He walked through the streets of Jerusalem and looked up, Jesus would see the mountains that surrounded the city.  In just this way The Lord surrounds those who are His own.  "His people" - a tribe, attendants, troop, a flock, a nation.  Zechariah 2:5 says " For I, declares The Lord, will be a wall of fire around her, and I will be the glory in her midst."  Psalm 32:7 says "Thou art my hiding place; Thou dost preserve me from trouble; Thou dost surround me with songs of deliverance."   Here is safety.  Here is peace. Here is hope.  Surrounded, encompassed by The Lord God Almighty.  He is a wall of fire.  He is the singer of songs proclaiming deliverance. "I extol Thee, my God, O King; and I will bless Your Name forever and ever" Psalm 145:1   You are my Shelter, my Shepherd, my God and King.  I am Yours.   I am hiding in Thee.  Praise and glory to You, forever and ever. Amen.
Hebrews 7 gives the explanation of the Priesthood of Jesus.  The writer's text is Psalm 110, a Messianic psalm written by David.   Jesus was not from the tribe of Levi, so He was not a Priest according to the Law.  He was from the tribe of Judah, but a priest according to the order of Melchizedek.  This Melchizedek is a mysterious figure.  The only things we know about him are: He was the king of Salem, a king of righteousness and peace.  He had no known genealogy.  He had no historical record of birth or death.  Abraham honored him with a gift, a tenth of the choice spoils, a tithe.  He blessed Abraham, and "the lesser is blessed by the greater".
So this title given to Jesus, "A priest forever according to the order of Melchizedek" the writer explains is unique and glorious.
1.  "For when the priesthood is changed,of necessity there takes place a change of law also." v12
2. This priesthood requires "the power of an indestructible life" ( A priest forever)
3. The Law was weak and useless in bringing anyone into perfect righteousness, but this brings a "better hope through which we draw near to God" (v19)
4. This priesthood was initiated by an oath, "The Lord has sworn and will not change His mind"
5. So Jesus guarantees "a better covenant" (v22) He abides forever and His position is permanent.
 Because Jesus qualified for this title we have a Savior Who saves us forever.  He makes intercession for us always.  He is holy, innocent, undefiled, exalted, and perfect forever.  There is no need for daily sacrifices offered up by imperfect priests for Jesus offered Himself, the perfect sacrifice,"once for all".  What a wonderful Saviour!