These are all according to scripture.
Jesus changed the OLD covenant to the New when he fulfilled the final blood sacrifice,
The Old Covenant priesthood changed when the Perfect sacrifice was fulfilled.
Because the final sacrifice of the Law was fulfilled, the priesthood changed.
When the priesthood changed, the temple changed from a physical building to a Spiritual people,
When the people were changed, the City of God was changed from an earthly to a heavenly spiritual city,
When the city of God was changed, the "holy nation" was changed,
When the nation was changed, the laws governing the holy nation were changed from being led of the letter (law) to the Spirit.
He changed circumcision from the flesh to circumcision of the heart and spirit.
He changed the sabbath from a 24 hour day into a daily rest from self-efforts and worry to resting in Christ.
He changed the command not to kill into a command to not even hate others and to love our enemies. John said if we hate our brother we are a murderer.
He changed the command not to commit adultery to not even look with lust upon another.
He even changed the language the New Testament scripture came to us in from Hebrew to Greek.
Hebrews 7:12 For the priesthood being changed,
===> there is made of necessity a change also of the law.
He changed the law of circumcision from the flesh to the heart.
He changed the temple from a building made with hands to a temple made without hands.
He changed the desolated unholy city of Jerusalem to "NEW Jerusalem coming down from above"... (Gal. 4:26)
He changed the people from a natural people of flesh to a born from above people of the Spirit.
He changed the kingdom of God from an earthly nation of this world to a "kingdom not of this world"...
He changed the physical nation of Israel into the one “holy nation” of God in which there is “neither Jew nor Greek” (Eph. 2)
That is the short list, but it clearly illustrates that the eternal unchanging God does change the manner in which he works among men.~
“Behold, days are coming,” declares the Lord, “when I will make a NEW covenant with the house of Israel and with the house of Judah
Luke 22:20 And in the same way He took the cup after they had eaten, saying, “This cup which is poured out for you is the new covenant in My blood.
25 In the same way He took the cup also after supper, saying, “This cup is the new covenant in My blood; do this, as often as you drink it, in remembrance of Me.”
6 He has enabled us to be ministers of his new covenant. This is a covenant not of written laws, but of the Spirit. The old written covenant ends in death; but under the new covenant, the Spirit gives life.
13 When God speaks of a “new” covenant, it means he has made the first one obsolete. It is now out of date and will soon disappear. (this happened with the finality of judgement upon Israel and the obliteration of the city, temple, priesthood, and nation.
15 [Christ, the Messiah] is therefore the Negotiator and Mediator of an [entirely] new agreement (testament, covenant), so that those who are called and offered it may receive the fulfillment of the promised everlasting inheritance—since a death has taken place which rescues and delivers and redeems them from the transgressions committed under the [old] first agreement.