Job 27:18

He buildeth his house as a moth,.... Which builds its house in a garment by eating into it, and so destroying it, and in time eats itself out of house and home, and however does not continue long in it, but is soon and easily shook out, or brushed off; so a wicked man builds himself an house, a stately palace, like Arcturus l; so some render the words from Job 9:9, a palace among the stars, an heavenly palace and paradise, and expects it will continue for ever; but as he builds it with the mammon of unrighteousness, and to the prejudice and injury of others, and with their money, or what was due to them, so by his sins and iniquities he brings ruin and destruction upon himself and his family, so that his house soon falls to decay, and at least he and his posterity have but a short lived enjoyment of it. This may be applied in a figurative sense to the hypocrite's hope and confidence, which is like a spider's web, a moth eaten garment, and a house built upon the sand; the Septuagint version here adds, "as a spider", Job 8:13;

and as a booth [that] the keeper maketh; either a keeper of sheep, who sets up his tent in a certain place for a while, for the sake of pasturage, and then removes it, to which the allusion is, Isaiah 38:12; or a keeper of fruit, as the Targum, of gardens and orchards, that the fruit is not stolen; or of fig trees and vineyards, as Jarchi and Bar Tzemach, which is only a lodge or hut pitched for a season, until the fruit is gathered in, and then is taken down, see Isaiah 1:8; and it signifies here the short continuance of the house of the wicked man, which he imagined would continue for ever, Psalms 49:11.

l כעש "quasi Arcturi", Junius Tremellius so Aben Ezra.