For Jesus taught that someday “all those in the memorial tombs” will be resurrected. John 5:28
Isaiah 25:8: He will actually swallow up death forever, and the Sovereign Lord Jehovah will certainly wipe the tears from all faces. And the reproach of his people he will take away from all the earth, for Jehovah himself has spoken [it].
Revelation 21: 3, 4: " With that I heard a loud voice from the throne say: “Look! The tent of God is with mankind, and he will reside with them, and they will be his peoples. And God himself will be with them. 4 And he will wipe out every tear from their eyes, and death will be no more, neither will mourning nor outcry nor pain be anymore. The former things have passed away.”
For more reference about this wonderful hope you can visit www.watchtower.org