OLD JERUSALEM and NEW JERUSALEM
Most biblical references to Jerusalem are to Old Jerusalem, but there is also several scriptures about a New Jerusalem.

Revelation 21:1-3 Then I saw “a new heaven and a new earth,” for the first heaven and the first earth had passed away, and there was no longer any sea. 2 I saw the Holy City, the new Jerusalem, coming down out of heaven from God, prepared as a bride beautifully dressed for her husband. 3 And I heard a loud voice from the throne saying, “Look! God’s dwelling place is now among the people, and he will dwell with them. They will be his people, and God himself will be with them and be their God.

COMMENTARY: Several scriptures refer to new heaven and new earth.

Revelation 3:1-13 Remember then what you received and heard; keep that, and repent. If you will not awake, I will come like a thief, and you will not know at what hour I will come upon you. 4 Yet you have still a few names in Sardis, people who have not soiled their garments; and they shall walk with me in white, for they are worthy. 5 He who conquers shall be clad thus in white garments, and I will not blot his name out of the book of life; I will confess his name before my Father and before his angels. 6 He who has an ear, let him hear what the Spirit says to the churches.’ 7 “And to the angel of the church in Philadelphia write: ‘The words of the holy one, the true one, who has the key of David, who opens and no one shall shut, who shuts and no one opens. 8 “‘I know your works. Behold, I have set before you an open door, which no one is able to shut; I know that you have but little power, and yet you have kept my word and have not denied my name. 9 Behold, I will make those of the synagogue of Satan who say that they are Jews and are not, but lie–behold, I will make them come and bow down before your feet, and learn that I have loved you. 10 Because you have kept my word of patient endurance, I will keep you from the hour of trial which is coming on the whole world, to try those who dwell upon the earth. 11 I am coming soon; hold fast what you have, so that no one may seize your crown. 12 He who conquers, I will make him a pillar in the temple of my God; never shall he go out of it, and I will write on him the name of my God, and the name of the city of my God, the new Jerusalem which comes down from my God out of heaven, and my own new name. 13 He who has an ear, let him hear what the Spirit says to the churches.’

COMMENTARY: Old Jerusalem is the city of Old/First Covenant religionists who are governed by religious laws. The New Jerusalem is the community of New Covenant disciples who are governed by God’s spiritual laws. The old Jerusalem is created by men, but the new Jerusalem comes from God out of heaven (i.e. clean, pure hearts.)

The End Times refers to the end of the Old Jerusalem a religious community created by man and the coming of the New Jerusalem created by God in the hearts of New Covenant disciples.

Galatians 4:21-26 Tell me, you who want to be under the law, are you not aware of what the law says? 22 For it is written that Abraham had two sons, one by the slave woman and the other by the free woman. 23 His son by the slave woman was born according to the flesh, but his son by the free woman was born as the result of a divine promise.

24 These things are being taken figuratively: The women represent two covenants. One covenant is from Mount Sinai and bears children who are to be slaves: This is Hagar.
25 Now Hagar stands for Mount Sinai in Arabia and corresponds to the present city of Jerusalem, because she is in slavery with her children.
26 But the Jerusalem that is above is free, and she is our mother.

COMMENTARY:

Hebrews 11:8-16 By faith Abraham, when called to go to a place he would later receive as his inheritance, obeyed and went, even though he did not know where he was going.

9 By faith he made his home in the promised land like a stranger in a foreign country; he lived in tents, as did Isaac and Jacob, who were heirs with him of the same promise.

10 For he was looking forward to the city with foundations, whose architect and builder is God.

11 And by faith even Sarah, who was past childbearing age, was enabled to bear children because she considered him faithful who had made the promise.
12 And so from this one man, and he as good as dead, came descendants as numerous as the stars in the sky and as countless as the sand on the seashore.
13 All these people were still living by faith when they died. They did not receive the things promised; they only saw them and welcomed them from a distance, admitting that they were foreigners and strangers on earth.
14 People who say such things show that they are looking for a country of their own.
15 If they had been thinking of the country they had left, they would have had opportunity to return.
16 Instead, they were longing for a better country—a heavenly one. Therefore God is not ashamed to be called their God, for he has prepared a city for them.

COMMENTARY:

Hebrews 12:18-23 You have not come to a mountain that can be touched and that is burning with fire; to darkness, gloom and storm; 19 to a trumpet blast or to such a voice speaking words that those who heard it begged that no further word be spoken to them, 20 because they could not bear what was commanded: “If even an animal touches the mountain, it must be stoned to death.”

21 The sight was so terrifying that Moses said, “I am trembling with fear.” 22 But you have come to Mount Zion, to the city of the living God, the heavenly Jerusalem. You have come to thousands upon thousands of angels in joyful assembly, 23 to the church of the firstborn, whose names are written in heaven. You have come to God, the Judge of all, to the spirits of the righteous made perfect.

COMMENTARY: