Charles Spurgeon Commentary Isaiah 26:21

"For, behold, Jehovah cometh forth out of his place to punish the inhabitants of the earth for their iniquity: the earth also shall disclose her blood, and shall no more cover her slain." — Isaiah 26:21 (ASV)

For, behold, the LORD cometh out of his place to punish the inhabitants of the earth for their iniquity: the earth also shall disclose her blood, and shall no more cover her slain.

The earth has often covered up the evidences of human guilt.

Blood shed in battle has soaked into the soil, and men have forgotten the violence of tyrants and conquerors, but the earth shall disclose her blood. Sin, though it is sown in the earth, shall spring up like wheat, but to a terrible harvest. Be sure your sin will find you out.