Abu Ali Al-Fudhail ibn Iyaz was asked about “the best deeds” in “who among you have the best deed” (Quran 11:7). He said: “The best of deeds: the most sincere and most correct.” They said: “What are the most sincere and most correct deeds?” He said: “Indeed God does not accept a deed if it is not sincere and correct, for if it is correct but insincere it won’t be accepted, and if it is sincere but incorrect it won’t be accepted, and sincerity is that the deed is done for Allah, and correctness is that it is upon the sunnah (traditions of the Prophet PBUH).