Narrated Thuwair - Ibn Abi Fakhitah:
from his father that 'Ali bin Abi Talib said: "There is no Ayah in the Qur'an more beloved to me than this Ayah: Verily Allah forgives not associating others with Him, but He forgives what is less than that for whomever He wills (4:116)." (ID)
English reference (ID): Vol. 5, Book 44, Hadith 3037 (ID)
Arabic reference (ID): Book 47, Hadith 3311 (ID)