Job's friend Eliphaz shares:
12 Now a thing was secretly brought to me, and mine ear received a little thereof.
13 In thoughts from the visions of the night, when deep sleep falleth on men,
14 Fear came upon me, and trembling, which made all my bones to shake.
15 Then a spirit passed before my face; the hair of my flesh stood up:
16 It stood still, but I could not discern the form thereof: an image was before mine eyes, there was silence, and I heard a voice, saying,
17 Shall mortal man be more just than God? shall a man be more pure than his maker?
18 Behold, he put no trust in his servants; and his angels he charged with folly:
19 How much less in them that dwell in houses of clay, whose foundation is in the dust, which are crushed before the moth?
20 They are destroyed from morning to evening: they perish for ever without any regarding it.
21 Doth not their excellency which is in them go away? they die, even without wisdom.
-- Job 4:12-21 (KJV)
The OT speaks about evil spirits from the Lord. Is this an evil spirit that Eliphaz has encountered? Is he sharing a past experience with Job to buttress his opinion of Job's misfortune?