In the Old Testament, it was foretold that Christ would save us and make us his bride. (Isa 61:10)
Isa 61:10 I will greatly rejoice in the Lord, my soul shall be joyful in my God; for he hath clothed me with the garments of salvation, he hath covered me with the robe of righteousness, as a bridegroom decketh himself with ornaments, and as a bride adorneth herself with her jewels.
Heaven is the place where Christ, who saved us, receives us as his bride. (Matthew 22:2, Matthew 25:1, Luke 14:16-17, Luke 12:35-36)
Matthew 22:2 The kingdom of heaven is like unto a certain king, which made a marriage for his son,
Matthew 25:1 Then shall the kingdom of heaven be likened unto ten virgins, which took their lamps, and went forth to meet the bridegroom.
Luke 14:16 Then said he unto him, A certain man made a great supper, and bade many: 17 And sent his servant at supper time to say to them that were bidden, Come; for all things are now ready.
Luke 12:35 Let your loins be girded about, and your lights burning; 36 And ye yourselves like unto men that wait for their lord, when he will return from the wedding; that when he cometh and knocketh, they may open unto him immediately.
Christ is our Bridegroom. (John 3:29, Ephesians 5:23-25,31-32)
John 3:29 He that hath the bride is the bridegroom: but the friend of the bridegroom, which standeth and heareth him, rejoiceth greatly because of the bridegroom's voice: this my joy therefore is fulfilled.
Ephesians 5:23 For the husband is the head of the wife, even as Christ is the head of the church: and he is the saviour of the body. 24 Therefore as the church is subject unto Christ, so let the wives be to their own husbands in every thing. 25 Husbands, love your wives, even as Christ also loved the church, and gave himself for it; 31 For this cause shall a man leave his father and mother, and shall be joined unto his wife, and they two shall be one flesh. 32 This is a great mystery: but I speak concerning Christ and the church.
We will participate in the marriage supper of the Lamb in heaven and become the bride of Christ. (Rev 19:7-9, Rev 21:2,9)
Rev 19:7 Let us be glad and rejoice, and give honour to him: for the marriage of the Lamb is come, and his wife hath made herself ready. 8 And to her was granted that she should be arrayed in fine linen, clean and white: for the fine linen is the righteousness of saints. 9 And he saith unto me, Write, Blessed are they which are called unto the marriage supper of the Lamb. And he saith unto me, These are the true sayings of God.
Rev 21:2 And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband. 9 And there came unto me one of the seven angels which had the seven vials full of the seven last plagues, and talked with me, saying, Come hither, I will shew thee the bride, the Lamb's wife.