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.

He shall lean upon his house - This is an allusion to the web or house of the spider. The hope of the hypocrite is called the house which he has built for himself; his home, his refuge, his support. But it shall fail him. In times of trial he will trust to it for support, and it will be found to be as frail as the web of the spider. How little the light and slender thread which a spider spins would avail a man for support in time of danger! So frail and unsubstantial will be the hope of the hypocrite! It is impossible to conceive any figure which would more strongly describe the utter vanity of the hopes of the wicked. A similar comparison occurs in the Koran, Sur. 28, 40: "They who assume any other patrons to themselves besides God, are like the spider building his house; for the house of the spider is most feeble."

He shall hold it fast - Or, he shall lay hold on it to sustain him, denoting the avidity with which the hypocrite seizes upon his hope. The figure is still taken from the spider, and is an instance of a careful observation of the habits of that insect. The idea is, that the spider, when a high wind or a tempest blows, seizes upon its slender web to sustain itself. But it is insufficient. The wind sweeps all away. So the tempest of calamity sweeps away the hypocrite, though he grasps at his hope, and would seek security in that, as a spider does in the light and tenuous thread which it has spun.

8:15 House - He shall trust to the multitude of his children and servants, and to his wealth, all which come under the name of a man's house in scripture. Hold it - To uphold himself by it. But his web, that refuge of lies, will be swept away, and he crushed in it.