There. The word has no expressed antecedent, but the general tenor of the passage supplies one. "There" is equivalent to "in the grave." The wicked cease from troubling; i.e." cease from their state of continual perturbation and unrest" (comp.
Isaiah 57:20, "But the wicked are like the troubled sea, when it cannot rest, whose waters cast up mire and dirt "). This is their condition, so long as they live; nothing satisfies them; they are always in trouble themselves, and always causing trouble to others.
In the grave alone do they rest, or seem to rest. And there the weary be at rest; literally, the weary in strength' or "in respect of strength;" i.e. those whose strength is utterly exhausted and worn out.
Here Job undoubtedly alludes to himself. He looks to the grave as his only refuge, the only hope he has of recovering peace and tranquillity.