He, either the spider, or rather, the wicked man signified by it, shall lean upon his house, i.e. he shall trust to the multitude and strength of his children and servants. and to his wealth, all which come under the name of a man's house in Scripture use. It shall not stand, i.e. not be able to uphold itself, nor him that trusted to it. He shall hold it fast; or, he shall take fast hold of it; not to uphold it, but to strengthen and uphold himself by it, as it is in the former branch.
Related Commentaries of Job 8:15
Job 8:15
15 He shall lean upon his house, but it shall not stand: he shall hold it fast, but it shall not endure.