Sahih al-Bukhari 32
Narrated 'Abdullah:
When the following Verse was revealed: "It is those who believe and 
     confuse not their belief with wrong (worshipping others besides 
     Allah.)" (6:83), the companions of Allah's Messenger (ﷺ) asked, "Who is 
     amongst us who had not done injustice (wrong)?" Allah revealed: "No 
     doubt, joining others in worship with Allah is a great injustice 
     (wrong) indeed." (31.13)
حَدَّثَنَا أَبُو الْوَلِيدِ، قَالَ حَدَّثَنَا شُعْبَةُ، ح‏.‏ قَالَ وَحَدَّثَنِي بِشْرٌ، قَالَ حَدَّثَنَا مُحَمَّدٌ، عَنْ شُعْبَةَ، عَنْ سُلَيْمَانَ، عَنْ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ، عَنْ عَبْدِ اللَّهِ، قَالَ لَمَّا نَزَلَتِ ‏{‏الَّذِينَ آمَنُوا وَلَمْ يَلْبِسُوا إِيمَانَهُمْ بِظُلْمٍ‏}‏ قَالَ أَصْحَابُ رَسُولِ اللَّهِ صلى الله عليه وسلم أَيُّنَا لَمْ يَظْلِمْ فَأَنْزَلَ اللَّهُ ‏{‏إِنَّ الشِّرْكَ لَظُلْمٌ عَظِيمٌ‏}‏‏.‏