Careful here, Uncle Chip:
Matt 25:52-53 And the graves were opened; and many bodies of the saints which slept arose, 53 And came out of the graves after his resurrection, and went into the holy city, and appeared unto many
I'm aware of that, but did these receive spiritual bodies at that time, and then were they taken up into heaven, or did they then just return to the grave after appearing to many. I am not sure either way. But we do have this from 1 Cor 15:
"But now is Christ risen from the dead and become the first fruits of them that slept...For as in Adam all die, even so in Christ shall all be made alive; but everyman in his own order: Christ the first fruits; afterward they that are Christ's at His coming.. Then cometh the end, when he shall have delivered up the Kingdom to God, even the Father ..." [vs 20-24]
I would not call this a resurrection, but a resuscitation.
Resurrection is when we receive our glorified bodies. Resuscitation is what happened to Lazarus, Jairus' daughter, Tabitha, and others. As far as we can tell their bodies were no changed and they went on to live normal lives, age, and pass away into glory, awaiting the final resurrection.
Their purpose was to testify to Jesus' messiahship.