Where do we read these Old Covenant faithful saints who were in the graves were BODILY resurrected, and went into the streets of JERUSALEM?
The text says simply that graves were opened, and many bodies of the saints came out of the graves and went into the HOLY CITY,
Matthew 27:52-53 (KJV) And the graves were opened; and many bodies of the saints which slept arose, And came out of the graves after his resurrection, and went into the holy city, and appeared unto many.
Body is often used in a figurative sense as we find in the following verses. Paul shows us that when we are in Christ, we, the Church as a whole, have become a spiritual body through Christ's Spirit in us. This is why, when we physically die in Christ, our natural body of flesh returns to dust of the earth and as the spiritual body of Christ our spirit returns to God who gave it a living soul.
Romans 12:5 (KJV) So we, being many, are one body in Christ, and every one members one of another.
1 Corinthians 12:12 (KJV) For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ.
1 Corinthians 12:27 (KJV) Now ye are the body of Christ, and members in particular.
Ephesians 3:6 (KJV) That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:
1 Corinthians 15:44 (KJV) It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.
These Old Covenant faithful saints could not ascend to heaven a spiritual body of Christ before the advent of the cross and resurrection of Christ that opened the doors of heaven that they and now all who are of the body of Christ may enter there. The text does not say those coming out of the graves went into Jerusalem of this earth. Jerusalem of this earth ceased to be the holy city of God when Christ was crucified. The holy city they went into and appeared to many is not of this earth. It is the Holy City of Heaven, where they were seen by the multitude of the heavenly host (appeared to many). This is where the spiritual body of Christ is and has been since the first advent of Christ. Because the spirit in us possesses eternal life and cannot die, the spirit of man, through the Holy Spirit of Christ in them goes to the heavenly realm of spirit beings, spirits of justified man made perfect. For we are no longer the church on this earth after death, we are the Church of the firstborn written in heaven. Mount Zion, the city of the living God, the heavenly Jerusalem dwelling with an innumerable company of angels.
Hebrews 12:22-24 (KJV) But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels, To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect, And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel.
When the Kingdom of God in heaven is complete, the last one to be saved has entered in through Christ's Spirit, the hour has come and the last/seventh trumpet will sound that there shall be no longer delay, time for being saved shall be no longer, we shall see the appearance of Christ coming again in the clouds, with His angelic hosts. This age shall be finished, and the eternal age begins where the complete body of Christ shall dwell with Christ forever on the new earth.
Revelation 21:1-2 (KJV) And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea. And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband.