Job 16:9 (ESV)

9 He has torn me in his wrath and hated me; he has gnashed his teeth at me; my adversary sharpens his eyes against me.

At the beginning of his path of suffering, Job had worshipped God as the sovereign Lord who is free to give and take (Job 1:21). But a change has taken place in Job, due to the reasoning of his friends and perhaps due to his ongoing pain. He now sees God as an enemy who has attacked him in fierce anger.