Did Old Testament believers believe in a resurrection?
Yes. The Old Testament alludes to resurrection, and its believers held that hope, though Scripture gives limited detail. Daniel 12 states it most clearly, while Job referenced his resurrection life and David expected to be resurrected. Unbelievers, however, are not raised at the same time as believers.
Les explains that the Old Testament certainly alludes to resurrection, and its people were believers in a resurrection, but there is not enough said about it to build any real knowledge concerning it. He points to Daniel chapter 12 as saying the most of any place, though Job made reference to his resurrection life and David expected to be resurrected. Daniel 12 opens with Michael standing up for Israel, a time of trouble like no other, and Israel being delivered—those written in the book. Les also notes the delineation that unbelievers will not be resurrected at the same time as believers.