This is essentially the same argument (Job 25:4-6) conveyed to Eliphaz by the deceiving spirit (Job 4:17-19), and then made to Job by Eliphaz (Job 15:14-16). Bildad here repeats it.

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8