﴿ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ عَلَيْكُمْ أَنفُسَكُمْ ۖ لَا يَضُرُّكُم مَّن ضَلَّ إِذَا ٱهْتَدَيْتُمْ ۚ إِلَى ٱللَّهِ مَرْجِعُكُمْ جَمِيعًۭا فَيُنَبِّئُكُم بِمَا كُنتُمْ تَعْمَلُونَ ﴾

“O you who have attained to faith! It is [but] for your own selves that you are responsible: those who go astray can do you no harm if you [yourselves] are on the right path. Unto God you all must return: and then He will make you [truly] understand all that you were doing [in life].”

One is Required to Reform Himself First Allah commands His believing servants to reform themselves and to do as many righteous deeds as possible. He also informs them that whoever reforms himself, he would not be affected by the wickedness of the wicked, whether they were his relatives or otherwise. Imam Ahmad recorded that Qays said, "Abu Bakr As-Siddiq stood up, thanked Allah and praised Him and then said, `O people! You read this Ayah, يأَيُّهَا الَّذِينَ ءَامَنُواْ عَلَيْكُمْ أَنْفُسَكُمْ لاَ يَضُرُّكُمْ مَّن ضَلَّ إِذَا اهْتَدَيْتُمْ (O you who believe! Take care of yourselves. If you follow the right guidance, no hurt can come to you from those who are in error.) You explain it the wrong way. I heard the Messenger of Allah ﷺ say, «إِنَّ النَّاسَ إِذَا رَأَوُا الْمُنْكَرَ وَلَا يُغَيِّرُونَهُ، يُوشِكُ اللهُ عَزَّ وَجَلَّ أَنْ يَعُمَّهُمْ بِعِقَابِه» (If the people witness evil and do not change it, then Allah is about to send His punishment to encompass them.) I (Qays) also heard Abu Bakr say, `O people! Beware of lying, for lying contradicts faith."' يِـأَيُّهَا الَّذِينَ ءَامَنُواْ شَهَـدَةُ بَيْنِكُمْ إِذَا حَضَرَ أَحَدَكُمُ الْمَوْتُ حِينَ الْوَصِيَّةِ اثْنَانِ ذَوَا عَدْلٍ مِّنْكُمْ أَوْ ءَاخَرَانِ مِنْ غَيْرِكُمْ إِنْ أَنتُمْ ضَرَبْتُمْ فِى الاٌّرْضِ فَأَصَابَتْكُم مُّصِيبَةُ الْمَوْتِ تَحْبِسُونَهُمَا مِن بَعْدِ الصَّلوةِ فَيُقْسِمَانِ بِاللَّهِ إِنِ ارْتَبْتُمْ لاَ نَشْتَرِى بِهِ ثَمَناً وَلَوْ كَانَ ذَا قُرْبَى وَلاَ نَكْتُمُ شَهَـدَةَ اللَّهِ إِنَّآ إِذَاً لَّمِنَ الاٌّثِمِينَ - فَإِنْ عُثِرَ عَلَى أَنَّهُمَا اسْتَحَقَّآ إِثْماً فَآخَرَانِ يِقُومَانُ مَقَامَهُمَا مِنَ الَّذِينَ اسْتَحَقَّ عَلَيْهِمُ الاٌّوْلَيَانِ فَيُقْسِمَانِ بِاللَّهِ لَشَهَـدَتُنَا أَحَقُّ مِن شَهَـدَتِهِمَا وَمَا اعْتَدَيْنَآ إِنَّا إِذاً لَّمِنَ الظَّـلِمِينَ - ذلِكَ أَدْنَى أَن يَأْتُواْ بِالشَّهَـدَةِ عَلَى وَجْهِهَآ أَوْ يَخَـفُواْ أَن تُرَدَّ أَيْمَـنٌ بَعْدَ أَيْمَـنِهِمْ وَاتَّقُوا اللَّهَ وَاسْمَعُواْ وَاللَّهُ لاَ يَهْدِى الْقَوْمَ الْفَـسِقِينَ