The command to fight the people until they say "La ilaha illallah Muhammad Rasul-Allah", and establish Salat, and pay the Zakat, and believe in everything that the prophet (ﷺ) brought. Whoever does that, his life and his wealth are protected except by its right, and his secrets are entrusted to Allah, the most high. Fighting those who withhold Zakat or other than that is one of the duties of Islam and the Iman should be concerned with the Laws of Islam
حَدَّثَنَا هَارُونُ بْنُ مَعْرُوفٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي عَمْرٌو، ح وَحَدَّثَنِي أَبُو الطَّاهِرِ، أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، عَنْ عَمْرِو بْنِ الْحَارِثِ، أَنَّ بَكْرَ بْنَ سَوَادَةَ، حَدَّثَهُ أَنَّ عَبْدَ الرَّحْمَنِ بْنَ جُبَيْرٍ حَدَّثَهُ أَنَّ عَبْدَ اللَّهِ بْنَ عَمْرِو بْنِ الْعَاصِ حَدَّثَهُ أَنَّ نَفَرًا مِنْ بَنِي هَاشِمٍ دَخَلُوا عَلَى أَسْمَاءَ بِنْتِ عُمَيْسٍ فَدَخَلَ أَبُو بَكْرٍ الصِّدِّيقُ وَهِيَ تَحْتَهُ يَوْمَئِذٍ فَرَآهُمْ فَكَرِهَ ذَلِكَ فَذَكَرَ ذَلِكَ لِرَسُولِ اللَّهِ صلى الله عليه وسلم وَقَالَ لَمْ أَرَ إِلاَّ خَيْرًا . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِنَّ اللَّهَ قَدْ بَرَّأَهَا مِنْ ذَلِكَ " . ثُمَّ قَامَ رَسُولُ اللَّهِ صلى الله عليه وسلم عَلَى الْمِنْبَرِ فَقَالَ " لاَ يَدْخُلَنَّ رَجُلٌ بَعْدَ يَوْمِي هَذَا عَلَى مُغِيبَةٍ إِلاَّ وَمَعَهُ رَجُلٌ أَوِ اثْنَانِ " ."
Abdullah b. 'Amr. b. al-'As reported that some persons from Banu Hisham entered the house of Asma' daughter of 'Umais when Abu Bakr also entered (and she was at that time his wife). He (Abu Bakr) saw it and disapproved of it and he made a mention of that to Allah's Messenger (ﷺ) and said:
I did not see but good only (in my wife). Thereupon Allah's Messenger (ﷺ) said: Verily Allah has made her immune from all this. Then Allah's Messenger (ﷺ) stood on the pulpit and said: After this day no man should enter the house of another person in his absence, but only when he is accompanied by one person or two persons.
Reference: Sahih Muslim 2173 In-book : Book 39, Hadith 31 USC-MSA web (English) : Book 26, Hadith 5403 (deprecated)
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