The Pilgrimage - 22:12
He supplicates to those who can neither benefit nor harm him apart from Allah. This is the extreme point of deviation.
Why did they serve those who could neither benefit nor harm them?
Prophet Jonah/10:18
"They leave Allah and serve those who can do them neither harm nor good, and say: "These will intercede for us with Allah". Say: "Do you inform Him of what Allah does not know in the heavens and the earth? He is Most High, far from what you associate partners with."