Surah 83. Al-Mutaffifin, Ayah 33

Lit., "they have not been sent as watchers over them" - implying that none who is devoid of faith has the right to criticize the faith of any of his fellow-men.

But the wicked critics of the Righteous have no call in any case to sit in judgment over them. Who set them as Keepers or guardians over the Righteous? Let them look to their own condition and future first.