Sahih Al Bukhari 1: Chapter 2, Hadith 32

(32) Zulm (wrong) of one kind can be greater or lesser than that of another

حَدَّثَنَا أَبُو الْوَلِيدِ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ حَدَّثَنَا شُعْبَةُ. ح قَالَ:‏‏‏‏ وحَدَّثَنِي بِشْرُ بْنُ خَالِدٍ أَبُو مُحَمَّدٍ الْعَسْكَرِيُّ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ حَدَّثَنَا مُحَمَّدُ، ‏‏‏‏‏‏عَنْ شُعْبَةَ، ‏‏‏‏‏‏عَنْ سُلَيْمَانَ، ‏‏‏‏‏‏عَنْ إِبْرَاهِيمَ، ‏‏‏‏‏‏عَنْ عَلْقَمَةَ، ‏‏‏‏‏‏عَنْ عَبْدِ اللَّهِ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ "لَمَّا نَزَلَتْ الَّذِينَ آمَنُوا وَلَمْ يَلْبِسُوا إِيمَانَهُمْ بِظُلْمٍ سورة الأنعام آية 82، ‏‏‏‏‏‏قَالَ أَصْحَابُ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:‏‏‏‏ أَيُّنَا لَمْ يَظْلِمْ؟ فَأَنْزَلَ اللَّهُ عَزَّ وَجَلَّ إِنَّ الشِّرْكَ لَظُلْمٌ عَظِيمٌ سورة لقمان آية 13".

SAHIH HADITH:

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 Apostle 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)

REFERENCE:

Sahih Al Bukhari 1: Chapter 2, Hadith 32