Albert Barnes Commentary Job 28:7

"That path no bird of prey knoweth, Neither hath the falcon`s eye seen it:" — Job 28:7 (ASV)

There is a path which no fowl knoweth - That is, a path in searching for gold and precious stones. The miner treads a way that is unseen by the bird of keenest vision. He penetrates into the deep darkness of the earth. The object of Job is to show the wisdom and the intrepidity of man in penetrating these dark regions in searching for sapphires and gold. The most far-sighted birds could not find their way to them. The most intrepid and fearless beasts of prey dared not venture to those dangerous regions.

The word rendered “fowl” (עיט ‛ ayı̂ṭ) means either a ravenous beast (Jeremiah 12:9), or more commonly a ravenous bird; see the notes at (Isaiah 46:11). According to Bochart, Hieroz. P. 11. L. 11. c. viii. p. 195, the word here denotes a rapacious bird of any kind; a bird that has keen vision.

Which the vulture’s eye hath not seen - The vulture is distinguished for the remarkable keenness of its vision. On the deserts of Arabia, it is said, when a camel dies, what seems at first to be a mere speck is almost immediately discerned far in the distant sky. As it draws nearer, it is perceived to be a vulture that had marked the camel as it fell, and that comes to prey upon it. This bird is proverbial for the keenness of its sight.