Acts 24

As Paul was confronted with Jewish and Roman leaders, he testified twice concerning the truth of the ressurection.  First, as he defended his beliefs before Felix -

"...worship I the God of my fathers, believing all things which are written in the law and in the prophets:
15 And have hope toward God, which they themselves also allow, that there shall be a resurrection of the dead, both of the just and unjust."  (New Testament | Acts 24:14 - 15)

And then before Agrippa when the Jewish leaders testified -

"...of one Jesus, which was dead, whom Paul affirmed to be alive."  (New Testament | Acts 25:19)

 I can just imagine how the Jewish leaders felt as Paul affirmed the Savior alive because he had seen Him.

The truth be had that all will be resurrected, not just the righteous. Paull would later write to the Corinthians -

"For as in Adam all die, even so in Christ shall all be made alive."  (New Testament | 1 Corinthians 15:22)