Yea, the light of the wicked shall be {e} put out, and the spark of his fire shall not shine.

(e) When the wicked is in his prosperity, then God changes his state: and this is his ordinary working for their sins.

Jamieson-Fausset-Brown Bible Commentary

5. That (Job 18:4) cannot be. The decree of God is unalterable, the light (prosperity) of the wicked shall at length be put out.

his fire-alluding to Arabian hospitality, which prided itself on welcoming the stranger to the fire in the tent, and even lit fires to direct him to it. The ungodly shall be deprived of the means to show hospitality. His dwelling shall be dark and desolate!

Matthew Henry's Concise Commentary

18:5-10 Bildad describes the miserable condition of a wicked man; in which there is much certain truth, if we consider that a sinful condition is a sad condition, and that sin will be men's ruin, if they do not repent. Though Bildad thought the application of it to Job was easy, yet it was not safe nor just. It is common for angry disputants to rank their opponents among God's enemies, and to draw wrong conclusions from important truths. The destruction of the wicked is foretold. That destruction is represented under the similitude of a beast or bird caught in a snare, or a malefactor taken into custody. Satan, as he was a murderer, so he was a robber, from the beginning. He, the tempter, lays snares for sinners wherever they go. If he makes them sinful like himself, he will make them miserable like himself. Satan hunts for the precious life. In the transgression of an evil man there is a snare for himself, and God is preparing for his destruction. See here how the sinner runs himself into the snare.