Isaiah 59:6

Their webs shall not become garments - The spider’s web is unfit for clothing; and the idea here is, that their works are as unfit to secure salvation as the attenuated web of a spider is for raiment. The sense is, says Vitringa, that their artificial sophisms avail nothing in producing true wisdom, piety, virtue, and religion, or the true righteousness and salvation of people, but are airy speculations. The works of the self-righteous and the wicked; their vain formality, their false opinions, their subtle reasonings, and their traditions, are like the web of the spider. They bide nothing, they answer none of the purposes of a garment of salvation. The doctrine is, that people must have some better righteousness than the thin and gossamer covering which their own empty forms and ceremonies produce (compare Isaiah 64:6).