Job 8:15

He shall lean upon his house - This is all allusion to the spider. When he suspects his web, here called his house, to be frail or unsure, he leans upon it in different parts, propping himself on his hinder legs, and pulling with his fore claws, to see if all be safe. If he find any part of it injured, he immediately adds new cordage to that part, and attaches it strongly to the wall. When he finds all safe and strong, he retires into his hole at one corner, supposing himself to be in a state of complete security, when in a moment the brush or the besom sweeps away both himself, his house, and his confidence. This I have several times observed; and it is in this that the strength and point of the comparison consist. The wicked, whose hope is in his temporal possessions strengthens and keeps his house in repair; and thus leans on his earthly supports; in a moment, as in the case of the spider, his house is overwhelmed by the blast of God's judgments, and himself probably buried in its ruins. This is a very fine and expressive metaphor, which not one of the commentators that I have seen has ever discovered.