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
It has been narrated on the authority of Abu Huraira that the Holy prophet (ﷺ) said:
Whoso obeys me obeys God, and whoso disobeys me disobeys God. Whoso obeys the commander (appointed by me) obeys me, and whoso disobeys the commander disobeys me. The same tradition transmitted by different persons omits the portion: And whose disobeys the commander disobeys me.
Reference: Sahih Muslim 1835 a, b In-book : Book 33, Hadith 46 USC-MSA web (English) : Book 20, Hadith 4518 (deprecated)
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