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
حَدَّثَنِي عَبْدُ اللَّهِ بْنُ الرُّومِيِّ الْيَمَامِيُّ، وَعَبَّاسُ بْنُ عَبْدِ الْعَظِيمِ الْعَنْبَرِيُّ، قَالاَ حَدَّثَنَا النَّضْرُ بْنُ مُحَمَّدٍ، حَدَّثَنَا عِكْرِمَةُ، - وَهُوَ ابْنُ عَمَّارٍ - حَدَّثَنَا إِيَاسٌ، عَنْ أَبِيهِ، قَالَ لَقَدْ قُدْتُ بِنَبِيِّ اللَّهِ صلى الله عليه وسلم وَالْحَسَنِ وَالْحُسَيْنِ بَغْلَتَهُ الشَّهْبَاءَ حَتَّى أَدْخَلْتُهُمْ حُجْرَةَ النَّبِيِّ صلى الله عليه وسلم هَذَا قُدَّامَهُ وَهَذَا خَلْفَهُ .
Iyas reported on the authority of his father:
I (had the honour of) leading the white mule on which rode Allah's Apostle (ﷺ) and with him were Hasan and Husain, till it reached the apartment of Allah's Apostle (ﷺ). The one amongst them was seated before him and the other one was seated behind him.
Reference: Sahih Muslim 2423 In-book : Book 44, Hadith 90 USC-MSA web (English) : Book 31, Hadith 5954 (deprecated)
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