New Jerusalem as the eternal marriage is portrayed by Adam and Eve in Genesis 2. This marriage is touched by words in Exodus 20, Song of Songs, Isaiah, Jeremiah, and Hosea. In the New Testament we begin in the gospels.
John the Baptist testified that he was the friend of the Bridegroom and that he rejoiced to hear the Bridegroom’s voice (John 3:29). Then John said, “He must increase, but I must decrease” (v. 30). This increase is all who, by believing into Jesus, receive eternal life (v. 14-16) and thereby become members of His bride. Eventually His bride, His increase, will be New Jerusalem.
In Matthew 9:15 the Lord said that He was the Bridegroom with His disciples. Because He was with them, the disciples were not mourning. He also said that He would be taken away from them (in ascension) until He comes again in visible glory for the wedding.
In Matthew 9, Mark 2, and Luke 5 the Lord spoke about the Bridegroom, the new garment, and the new wine. To prepare us to be His bride, we need Him as our new garment, to be our righteousness before God. We also need Him as our new wine to enliven and energize us that we may love Him and live Him daily.
In Matthew 25 the Lord spoke a parable about the wedding feast. He tells us that when He, the Bridegroom comes, all who are ready for Him will go with Him into the wedding feast. The coming of Jesus Christ as the Bridegroom will be His coming at the close of this age to receive all His believers to Himself (as in 1 Thessalonians 4:13-18).
This wedding feast will bring us onward to the full reality of New Jerusalem in eternity.