Your fleshly body is not you. You are the "breath of life" which your Creator breathed into your body when you became a living, human soul. From Adam's body, Eve was created, and from theirs, we were created... "formed of the dust of the ground". But your life, spirit, or aspiration was breathed into your body by the very life and love of God.
"And the LORD formed man of the dust of the ground, and breathed into his nostrils the breath of life, and man became a living soul." Gen.2:7.
Our spirits were given a human, physical body in which we would live this life on Earth and by which we could express our unique, individual personalities, thoughts, actions, decisions, and aspirations, as free will human beings. Free to choose, but fully accountable to our Creator God. God's breath gave physical life capable of spiritual aspiration.
When the body dies, physical respiration ceases and our life ... spirit ... aspiration leaves the fleshly, physical body and the physical world. This, is just as the Spirit of Christ left the the physical body of Mary's child, Jesus, hanging on the cross. And while the dead physical body of Jesus was taken down and buried in a tomb, the Spirit of Christ descended into the heart of the earth to give the fulfilled Gospel of salvation to the O.T. saints in Paradise. They were kept there, awaiting Jesus's prophesied death, the fulfilled payment for their sins, before they could enter the presence of holy God in Heaven. When Jesus Christ arose, they arose from wherever their bodies had been buried and those buried in Jerusalem arose and walked in the city until Jesus finished his business with the New Testament saints there. Then continued on into Heaven to deliver those O.T. saints, who had been "captivated", or securely guarded, in "Abraham's Bosom", or Paradise, in the heart of the earth, across a great gulf from the regions of the O.T. damned, lost in hell.
"And it came to pass, that the beggar died, and was carried by the angels into Abraham's bosom: the rich man also died, and was buried, and in hell, he lift up his eyes ... and seeth Abraham afar off, and Lazarus in his bosom. And he cried and said, Father Abraham, have mercy on me .... for I am tormented in this flame. But Abraham said, Son, remember that thou in thy lifetime receivedst thy good things, and likewise Lazarus evil things: but now he is comforted, and thou art tormented. And besides all this, between us and you there is a great gulf fixed: so that they which would pass from hence to you cannot; neither can they pass to us, that would come from thence." Lk. 16:22-26.
"... so shall the Son of man be three days and three nights in the heart of the earth." Matt.12:40.
"For for this cause was the gospel preached also to them that are dead, that they might be judged according to men in the flesh, but live according to God in the spirit." 1 Pet.4:6.
"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." Matt.27:52-53.
All of that was the preservation of the O.T. saints' spirits and then a rejoining with, and resurrection of their new glorified bodies. Their spirits had been kept in Paradise (Abraham's Bosom) until the sin debt was paid and Messiah came for them. Those buried in Jerusalem evidently arose and visited while awaiting Christ Jesus to finish his business with the New Testament saints living in Jerusalem: But then, He continued His holy ascension into heaven with the Old Testament saints. Prior to the crucifixion, their sins had not yet been fully atoned for, in fulfillment of their faith in their future, coming Messiah. They looked forward to him, in faith, while they were still serving Him during their earthly lives in the O.T.