Job 15:23 - Matthew Poole's English Annotations on the Holy Bible

His poverty is so great, that he is forced to wander hither and thither to seek for bread, and cannot find it. A just punishment for him that took away the bread and substance of others by violence. He knoweth; he is assured of it from his own guilty conscience. The day of darkness, i.e. the time of his total, and irrecoverable, and everlasting destruction. Is ready at his hand, i.e. ready to seize upon him, or take him by the hand or shoulder like a serjeant to arrest him. The words may well he rendered, was prepared by his hand, i.e. by his works or actions; which being most commonly done with the hand, are oft called by that name, as Exodus 14:31 Judges 9:16 Proverbs 10:4, Proverbs 12:24. So the sense is, He is conscious to himself that by his wicked life he hath prepared and stored up calamities and destruction for himself, and therefore he expected nothing less.