Charles Ellicott Commentary Job 6:15

"My brethren have dealt deceitfully as a brook, As the channel of brooks that pass away;" — Job 6:15 (ASV)

Have dealt deceitfully as a brook. —This is one of the most celebrated poetical similes in the book, and carries us to life in the desert, where the wadys, so mighty and torrent-like in the winter, are insignificant streams or fail altogether in summer. So when the writer saw the Guadalquivir (or mighty wady) at Cordova, in August, it was a third-rate stream, running in many divided currents in its stony bed.