It is reported by Abu Sa'eed Khudri (Radhiyallaho anho) that the Holy Prophet (Sallallaho alaihe wasal- lam) said:
"Whoever sees a forbidden thing being done, he must prevent it by the use of his hand; and if he has no power for this action, then he should pre- vent it with his tongue; and if he cannot do this even, then he should at least consider it a vice in his heart, and this is a very low level of one's faith."
In another hadith, it has been said that if a person can prevent evil with his tongue then he should so pre- vent it; otherwise, he should at least think it evil in his heart and thus stand exonerated. Another hadith says that if anyone hates sin within his heart, he is a true believer, but this is the weakest form of faith. This topic has occurred in many other sayings of the Prophet. Now think well how many Muslims there are who act upon this hadith in a practical way. How many of us prevent evil forcibly, how many with the tongue, and how many seriously hate it within our heart? We have to take stock of ourselves on these issues.