Isaiah 26:21

the Lord is coming forth (fut. instans) out of his place i.e. heaven. Cf. Micah 1:3.

the earth also … blood Uncovered blood cries for vengeance (Genesis 4:11; Ezekiel 24:7-8); and the earth, by drinking in innocent blood, seems to conspire with the murderer, by concealing his guilt. Comp. Job's impassioned cry in Job 16:18.

shall no more cover her slain The idea here is the same: the earth will expose the dead bodies as evidence against the persecutors. It is at least doubtful if there is any thought of actual resurrection.