Ps 102:26-27 They will perish, but You will endure; Yes, they will all grow old like a garment;
Like a cloak You will change them, And they will be changed.
Unfortunately for those who believe in immutability, this verse does not actually say “God does not change.” The verse supports the concept of God as being everlasting. He never perishes, but he can change his mind.
Heb 1:1-10 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; 3 who being the brightness of His glory and the express image of His person, and upholding all things by the word of His power, when He had by Himself purged our sins, sat down at the right hand of the Majesty on high, 4 having become so much better than the angels, as He has by inheritance obtained a more excellent name than they.
5 For to which of the angels did He ever say: “You are My Son, Today I have begotten You”?And again: “I will be to Him a Father, And He shall be to Me a Son”? 6 But when He again brings the firstborn into the world, He says: “Let all the angels of God worship Him.”7 And of the angels He says: “Who makes His angels spirits And His ministers a flame of fire.”8 But to the Son He says: “Your throne, O God, is forever and ever; A scepter of righteousness is the scepter of Your kingdom. 9 You have loved righteousness and hated lawlessness; Therefore God, Your God, has anointed You With the oil of gladness more than Your companions.”10 And: “You, Lord, in the beginning laid the foundation of the earth, And the heavens are the work of Your hands.
Again this verse really does not say “God does not change.” There is a reference to Jesus as being everlasting but not immutable. What is implied by classical theists is “that the Son is forever and ever, therefore the Son is eternal.” Since the Son is eternal he must also be immutable. As will be shown, the concept of the eternal now, eternality, is not Scriptural therefore it does not follow that “since He is eternal then he must be immutable.”