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wa-man ʾaẓlamu mimmani ftarā ʿalā llāhi kadhiban ʾaw kadhdhaba bi-ʾāyātihī ʾinnahū lā yufliḥu ẓ-ẓālimūna
Who is a greater wrongdoer than him who fabricates a lie against Allah, or denies His signs? Indeed the wrongdoers will not be felicitous.
— Ali Quli Qarai
Surah Al-‘An’am, Verse 21
The greatness of the guilt of being polytheist – The polytheist shall themselves deny polytheism which they had themselves held as their conviction – They shall desire to be returned to this life
21. "And who is more unjust than him who forges a lie against Allah or denies His Signs; Verily the unjust will not succeed. "
The Qur'anic expression /wa man azlamu/ (and who is more unjust) has occurred in the Qur'an about fifteen times. This phrase has been used with the senses of calumny against Allah , barring people from going into the mosques, and concealing the testimony of the Truth. This denotes that cultural injustice and barring people from rectitude and comprehension, is the worst injustice upon the society. Setting a stone and a piece of wood equal to the Lord is an injustice toward Him, and worshipping them is an injustice toward humanity. Therefore, the unjust people will never meet the true salvation. The above-mentioned verse says:
The more, an oppressed person is dear and holy, the more intense is the danger of transgression against him. That is why being unjust toward the Lord and the Sacred House, and belying against Divine Holy Essence, are the worst injustice:
Transgression upon the thought and culture of nations is one of the worst transgressions. Polytheism, forging a lie against Allah, a false claim of being the divine prophet, innovation, interpretation of the Qur'an by personal opinion, concealing the Truth, and the like, are all kinds of this sort of injustice. The following couple of traditions are recorded in Qurar-ul-Hikam, vol. 1, p. 149. Imam Amir-ul-Mu'mineen Ali (as) said:
"Avoid transgression. It is the greatest sin. Verily every transgressor will be punished for his transgression."
Again, he (as) said:
"Avoid cruelty. Whoever commits it, his life will become dark."