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
Allah's Messenger (ﷺ) stood up (to pray) and we heard him say:" I seek refuge in Allah from you." Then said:" curse you with Allah's curse" three times, then he stretched out his hand as though he was taking hold of something. When he finished the prayer, we said: Messenger of Allah, we heard you say something during the prayer which we have not heard you say before, and we saw you stretch out your hand. He replied: Allah's enemy Iblis came with a flame of fire to put it in my face, so I said three times:" I Seek refuge in Allah from you." Then I said three times:" I curse you with Allah's full curse." But he did not retreat (on any one of these) three occasions. Thereafter I meant to seize him. I swear by Allah that had it not been for the supplication of my brother Sulaiman he would have been bound, and made an object of sport for the children of Medina.
Reference: Sahih Muslim 542 In-book : Book 5, Hadith 51 USC-MSA web (English) : Book 4, Hadith 1106 (deprecated)
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