Sahih al-Bukhari 4629
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · "It is those who believe (in the Oneness of Allah and worship none but Him Alone) and confuse not their belief with Zuim (wrong i.e., by worshipping others besides Allah).. ." (V.6:82)
Narrated `Abdullah:
حَدَّثَنِي مُحَمَّدُ بْنُ بَشَّارٍ ، حَدَّثَنَا ابْنُ أَبِي عَدِيٍّ ، عَنْ شُعْبَةَ ، عَنْ سُلَيْمَانَ ، عَنْ إِبْرَاهِيمَ ، عَنْ عَلْقَمَةَ ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ قَالَ لَمَّا نَزَلَتْ {وَلَمْ يَلْبِسُوا إِيمَانَهُمْ بِظُلْمٍ} قَالَ أَصْحَابُهُ وَأَيُّنَا لَمْ يَظْلِمْ فَنَزَلَتْ {إِنَّ الشِّرْكَ لَظُلْمٌ عَظِيمٌ}
When:"...and confuse not their belief with wrong." (6.82) was revealed, the Prophet's companions said, "Which of us has not done wrong?" Then there was revealed:-- "Verily joining others in worship with Allah is a tremendous wrong indeed." (31.13)