John Gill

And they were confounded because they had hoped,.... When they came to the places where they hoped to find water, finding none were ashamed of their vain hope, and reflected upon themselves for being so foolish as to raise their expectations upon such a groundless surmise: they came thither, and were ashamed; which is the same thing expressed in different words; and aptly enough describes Job's disappointment in not meeting with that relief and comfort he expected from his friends, to whom he makes application of all this in the following words.