John Gill Commentary Job 15:18

"(Which wise men have told From their fathers, and have not hid it;" — Job 15:18 (ASV)

Which wise men have told from their fathers
Men wise in the best sense, not to do evil, but to do good; not worldly wise men, but such who have wisdom, sound wisdom in the inward parts; who are wise to salvation, and who are partakers of divine and spiritual wisdom; and such men, as they would never tell an untruth, so they would never report a false or a foolish thing they had heard, nor any thing but upon a good testimony, what they have received from their fathers, who were also wise and good men; and therefore such a testimony, though not ocular, but by tradition, deserves regard:

and have not hid [it] ;
their fathers did not hide it from them, and what they have received from their fathers they did not hide it from their children; and so it came to be handed down from one to another with great truth, exactness, and certainty, and to be depended upon, see (Psalms 44:1) (Psalms 78:3Psalms 78:4) .