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Surah 5. Al-Ma'ida
Ayah 105
105يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ عَلَيْكُمْ أَنفُسَكُمْ ۖ لَا يَضُرُّكُم مَّن ضَلَّ إِذَا ٱهْتَدَيْتُمْ ۚ إِلَى ٱللَّهِ مَرْجِعُكُمْ جَمِيعًا فَيُنَبِّئُكُم بِمَا كُنتُمْ تَعْمَلُونَ
[105] O Believers, look after your own souls ; it can do no harm to you, if anyone else goes astray, provided that you yourselves are on the right path.119 To Allah shall you all return :then He will let you know what you have been doing.
119This is a warning against a common human weakness. Some people are always on the look-out to find out and criticize errors in others. Here such people have been admonished against this evil and asked to concentrate their attention on their own acts, deeds, morals and beliefs instead of probing into and criticizing the conduct and beliefs of others. If a man himself is obedient to Allah and fulfills his obligations to Him and man, and treads the path of truth and righteousness, which also includes the establishment of virtue and the eradication of vice, then most surely the crookedness and deviation of any other can do him no harm.
This verse however, does not mean that a person should think only of his own salvation and leave alone the reform of others. Hadrat Abu Bakr Siddiq refuted this misconception in an address, saying, "O people, you recite this verse and put on it a wrong interpretation. I myself heard the Holy Prophet say, `When the people become so indifferent that they see evil and do not try to eradicate it and see an unjust person doing an injustice and do not prevent him from it, Allah may punish all of them.' I swear by Allah that it is obligatory on you to enjoin virtue and forbid evil; (if you neglect this) Allah will place you under the worst people who will inflict hardships on you. Then your good people will offer prayers but He will not accept these."