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 يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنِ ابْنِ شِهَابٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ، عَبْدِ اللَّهِ عَنِ ابْنِ عَبَّاسٍ، عَنِ الصَّعْبِ بْنِ جَثَّامَةَ اللَّيْثِيِّ، أَنَّهُ أَهْدَى لِرَسُولِ اللَّهِ صلى الله عليه وسلم حِمَارًا وَحْشِيًّا وَهُوَ بِالأَبْوَاءِ - أَوْ بِوَدَّانَ - فَرَدَّهُ عَلَيْهِ رَسُولُ اللَّهِ صلى الله عليه وسلم قَالَ فَلَمَّا أَنْ رَأَى رَسُولُ اللَّهِ صلى الله عليه وسلم مَا فِي وَجْهِي قَالَ إِنَّا لَمْ نَرُدَّهُ عَلَيْكَ إِلاَّ أَنَّا حُرُمٌ "
Al-Sa'b b. Jaththama al-Laithi reported that he presented a wild ass to Allah's Messenger (ﷺ) when he was at al-Abwa', or Waddan, and he refused to accept it. He (the narrator) said:
When the Messenger of Allah (ﷺ) looked into my face (which had the mark of dejection as my present had been rejected by him) he (in order to console me) said: We have refused it only because we are in a state of Ihram.
Reference: Sahih Muslim 1193 a In-book : Book 15, Hadith 55 USC-MSA web (English) : Book 7, Hadith 2701 (deprecated)
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