The Holy Quran 29:68 — Surah Al-'Ankabut
Arabic text
وَمَنْ أَظْلَمُ مِمَّنِ ٱفْتَرَىٰ عَلَى ٱللَّهِ كَذِبًا أَوْ كَذَّبَ بِٱلْحَقِّ لَمَّا جَآءَهُۥٓ ۚ أَلَيْسَ فِى جَهَنَّمَ مَثْوًى لِّلْكَـٰفِرِينَ
Translation
Who can be more unjust than he who invents (forges) lies against Allaah (by ascribing partners to Him) or rejects (out right) the truth when it comes to him? Is there not an abode for the Kaafiroon in Jahannam? (Jahannam shall certainly be their final destination.)
Tafsir (excerpt) — Tafsir Usmani
that is, the greatest injustice is to set up a partner with Allah, or to attribute to Him things unbefitting His majesty, or to begin denying the truth the Prophet has brought as soon as one hears it.
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