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
Abu Salama b. 'Abd al-Rahman and Ibn 'Abbas. (Allah be pleased with them) got together in the house of Abu Huraira (Allah be pleased with him) and began to discuss about the woman who gave birth to a child a few nights after the death of her husband. Ibn 'Abbas (Allah be pleased with then) ) said:
Her 'Idda is that period which is longer of the two (between four months and ten days and the birth of the child, whichever is longer). Abu Salama, however said: Her period of 'Idda is over (with the birth of the child), and they were contending with each other over this issue, whereupon Abu Huraira (Allah be pleased with him) said: I subscribe (to the view) held by my nephew (i.e. Abu Salama). They sent Kuraib (the freed slave of Ibn 'Abbas) to Umm Salama to ask her about it. He came (back) to them and informed them that Umm Salama (Allah be pleased with her) said that Subai'ah al-Aslamiyya gave birth to a child after the death of her husband when the few flights (had hardly) passed and she made mention of that to Allah's Messenger (ﷺ) and he commanded her to marry.
Reference: Sahih Muslim 1485 a In-book : Book 18, Hadith 71 USC-MSA web (English) : Book 9, Hadith 3537 (deprecated)
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