Job 30:2 - Ellicott's Commentary On The Whole Bible

Whereto might the strength of their hands profit me, is the description of the fathers; Job 30:3 seqq. describes their children. The people here spoken of seem to have been somewhat similar to those known to the ancients as Troglodytes (Herod. iv. 183, &c.), the inhabitants of caves, who lived an outcast life and had manners and customs of their own. They are desolate with want and famine. They flee into the wilderness on the eve of wasteness and desolation, or when all is dark (yester night), waste, and desolate. It is evident that Job must have been familiar with a people of this kind, an alien and proscribed race living in the way he mentions.