“I will lift up mine eyes unto the hills, from whence cometh my help? My help cometh from the LORD, which made heaven and earth.
He will not suffer thy foot to be moved: He that keepeth thee will not slumber. Behold, He that keepeth Israel shall neither slumber nor sleep.
The LORD is thy keeper: the LORD is thy shade upon thy right hand.
The sun shall not smite thee by day, nor the moon by night.
The LORD shall preserve thee from all evil: He shall preserve thy soul.
The LORD shall preserve thy going out and thy coming in from this time forth, and even for evermore.” Psalm 121:1-8 (KJB)
“Why boastest thou thyself in mischief, O mighty man? The goodness of God endureth continually.
Thy tongue deviseth mischiefs; like a sharp razor, working deceitfully. Thou lovest evil more than good; lying rather than to speak righteousness. Selah.
Thou lovest all devouring words, O deceitful tongue.
God shall likewise destroy thee for ever, He shall take thee away, and pluck thee out of thy dwelling place, and root thee out of the land of the living. Selah.
The righteous also shall see, and fear, and shall laugh at him: Lo, this is the man that made not God his strength; but trusted in the abundance of his riches, and strengthened himself in his wickedness. But I am like a green olive tree in the house of God: I trust in the mercy of God for ever and ever.
I will praise Thee for ever, because Thou hast done it: and I will wait on Thy name; for it is good before Thy saints.” Psalm 52:1-9 (KJB)
“My heart is inditing a good matter: I speak of the things which I have made touching the King: my tongue is the pen of a ready writer.
Thou art fairer than the children of men: grace is poured into Thy lips: therefore God hath blessed Thee for ever.
Gird thy sword upon Thy thigh, O Most Mighty, with Thy glory and Thy majesty. And in Thy majesty ride prosperously because of truth and meekness and righteousness; and Thy right hand shall teach Thee terrible things.
Thine arrows are sharp in the heart of the King’s enemies; whereby the people fall under Thee.
Thy throne, O God, is for ever and ever: the sceptre of Thy kingdom is a right sceptre. Thou lovest righteousness, and hatest wickedness: therefore God, Thy God, hath anointed Thee with the oil of gladness above Thy fellows. All Thy garments smell of myrrh, and aloes, and cassia, out of the ivory palaces, whereby they have made thee glad.” Psalm 45:1-8 (KJB)
“Jesus Christ the same yesterday, and to day, and for ever.” Hebrews 13:8 (KJB)
Jesus Christ the second member of the Holy Trinity, the Son of God, God the Son is Immutable just as the whole of the Godhead.
This verse is referring back to verse 7, and prepping the reader for verse 9. This is the same Jesus Christ who worked in the Old Testament; died, was buried, and rose again according to the gospels; ascended into Heaven; and He lives forevermore.
The following commentary is from the Jamieson, Fausset, and Brown Commentary…
“This verse is not, as some read it, in apposition with “the end of their conversation” (Heb_13:7), but forms the transition. “Jesus Christ, yesterday and to-day (is) the same, and (shall be the same) unto the ages (that is, unto all ages).” The Jesus Christ (the full name being given, to mark with affectionate solemnity both His person and His office) who supported your spiritual rulers through life even unto their end “yesterday” (in times past), being at once “the Author and the Finisher of their faith” (Heb_12:2), remains still the same Jesus Christ “to-day,” ready to help you also, if like them you walk by “faith” in Him. Compare “this same Jesus,” Act_1:11. He who yesterday (proverbial for the past time) suffered and died, is to-day in glory (Rev_1:18). “As night comes between yesterday and to-day, and yet night itself is swallowed up by yesterday and to-day, so the “suffering” did not so interrupt the glory of Jesus Christ which was of yesterday, and that which is to-day, as not to continue to be the same. He is the same yesterday, before He came into the world, and to-day, in heaven. Yesterday in the time of our predecessors, and to-day in our age” [Bengel]. So the doctrine is the same, not variable: this verse thus forms the transition between Heb_13:7 and Heb_13:9. He is always “the same” (Heb_1:12). The same in the Old and in the New Testament.”