Narrated `Abdullah:
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)
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 153
Arabic reference: Book 65, Hadith 4629