31 But regarding the resurrection of the dead, have you not read what was spoken to you by God: 32 ‘I am the God of Abraham, and the God of Isaac, and the God of Jacob’? He is not the God of the dead but of the living.” 33 When the crowds heard this, they were astonished at His teaching. Mathew 22:31-33
How is it that Abraham, Issac and Jacob are all dead yet the voice from the burning bush says "I am (present tense) The God of Abraham, Issac and Jacob". Then Jesus adds. God is the God of the living not the dead. This passage is very clear to anyone with an open mind. Our bodies die but our spirit lives on. (2Cor.5:8) With out a spirit that survives death there can be no resurrection but becomes a re-creation or a copy of another body.
They are in the grave awaiting a resurrection...
Heb 11:13
These all died in faith, not having received the promises, but having seen them afar off, and were persuaded of them, and embraced them, and confessed that they were strangers and pilgrims on the earth.
Act 2:34 For David is not ascended into the heavens: but he saith himself, The LORD said unto my Lord, Sit thou on my right hand,
Act 2:29 Men and brethren, let me freely speak unto you of the patriarch David, that he is both dead and buried, and his sepulchre is with us unto this day.
1Co 15:22 For as in Adam all die, even so in Christ shall all be made alive.
1Co 15:23 But every man in his own order: Christ the firstfruits; afterward they that are Christ's at his coming.
They are dead, buried and awaiting a resurrection at the return of Christ.
1Co 15:51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
1Co 15:52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
1Th 4:16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
1Th 4:17 Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
At the last trumpet, at return of Christ.