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
This hadith has been transmitted on the authority of Abdullah b. Mas'ud (who said):
We were along with Allah's Messenger (ﷺ) at Mina, that moon was split up into two. One of its parts was behind the mountain and the other one was on this side of the mountain. Allah's Messenger (may peace be upbn him) said to us: Bear witness to this.
Reference: Sahih Muslim 2800 b In-book : Book 52, Hadith 28 USC-MSA web (English) : Book 39, Hadith 6725 (deprecated)
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