صَحِيحُ مُسْلِمٍ
Sahih Muslim 23 b
The Book of Faith
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 Imam should be concerned with the Laws of Islam
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ، ح وَحَدَّثَنِيهِ زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، كِلاَهُمَا عَنْ أَبِي مَالِكٍ، عَنْ أَبِيهِ، أَنَّهُ سَمِعَ النَّبِيَّ صلى الله عليه وسلم يَقُولُ مَنْ وَحَّدَ اللَّهَ ثُمَّ ذَكَرَ بِمِثْلِهِ .
Abu Malik narrated on the authority of his father that he heard the Messenger (ﷺ) say: He who held belief in the unity of Allah, and then narrated what has been stated above.
Sahih Muslim, 23 bSahihصحيح