Jamieson, Fausset and Brown on Isaiah 26:19

19. In antithesis to Is 26:14, "They (Israel's foes) shall not live"; "Thy (Jehovah's) dead men (the Jews) shall live," that is, primarily, be restored, spiritually (Is 54:1-3), civilly and nationally (Is 26:15); whereas Thy foes shall not; ultimately, and in the fullest scope of the prophecy, restored to life literally (Eze 37:1-14; Da 12:2).

together with my dead body--rather, "my dead body," or "bodies" (the Jewish nation personified, which had been spiritually and civilly dead; or the nation, as a parent, speaking of the bodies of her children individually, see on Is 26:9, "I," "My"): Jehovah's "dead" and "my dead" are one and the same [Horsley]. However, as Jesus is the antitype to Israel (Mt 2:15), English Version gives a true sense, and one ultimately contemplated in the prophecy: Christ's dead body being raised again is the source of Jehovah's people (all, and especially believers, the spiritual Israelites) also being raised (1Co 15:20-22).

Awake--(Ep 5:14), spiritually.

in dust--prostate and dead, spiritually and nationally; also literally (Is 25:12; 47:1).

dew--which falls copiously in the East and supplies somewhat the lack of rain (Ho 14:5).

cast out ... dead--that is, shall bring them forth to life again.