Verse 15
Behold, he putteth no trust in his saints; yea, the heavens are not clean in his sight - The Vulgate has, "Behold, among his saints, none is immutable; and the heavens are not clean in his sight."
Coverdale - Beholde, he hath found unfaithfulnesse amonge his owne sanctes, yea the very heavens are unclene in his sight.
Eliphaz uses the same mode of speech, Job 4:17-18 (note); where see the notes. Nothing is immutable but God: saints may fall; angels may fall; all their goodness is derived and dependent. The heavens themselves have no purity compared with his.