When Messenger of Allah ﷺ died and Abu Bakr became the caliph some Arabs renegade (reverted to disbelief) (Abu Bakr decided to declare war against them), ʿUmar, said to Abu Bakr, "How can you fight with these people although Messenger of Allah ﷺ said, 'I have been ordered (by Allah) to fight the people till they say: "None has the right to be worshipped but Allah, and whoever said it then he will save his life and property from me except on trespassing the law (rights and conditions for which he will be punished justly), and his accounts will be with Allah.' " Abu Bakr said, "By Allah! I will fight those who differentiate between the prayer and the Zakat as Zakat is the compulsory right to be taken from the property (according to Allah's orders) By Allah! If they refuse to pay me even a she-kid which they used to pay at the time of Messenger of Allah ﷺ . I would fight with them for withholding it" Then ʿUmar said, "By Allah, it was nothing, but Allah opened Abu Bakr's chest towards the decision (to fight) and I came to know that his decision was right."  

لَمَّا تُوُفِّيَ رَسُولُ اللَّهِ ﷺ وَكَانَ أَبُو بَكْرٍ ؓ وَكَفَرَ مَنْ كَفَرَ مِنَ الْعَرَبِ فَقَالَ عُمَرُ ؓ كَيْفَ تُقَاتِلُ النَّاسَ وَقَدْ قَالَ رَسُولُ اللَّهِ ﷺ أُمِرْتُ أَنْ أُقَاتِلَ النَّاسَ حَتَّى يَقُولُوا لاَ إِلَهَ إِلاَّ اللَّهُ فَمَنْ قَالَهَا فَقَدْ عَصَمَ مِنِّي مَالَهُ وَنَفْسَهُ إِلاَّ بِحَقِّهِ وَحِسَابُهُ عَلَى اللَّهِ فَقَالَ وَاللَّهِ لأُقَاتِلَنَّ مَنْ فَرَّقَ بَيْنَ الصَّلاَةِ وَالزَّكَاةِ فَإِنَّ الزَّكَاةَ حَقُّ الْمَالِ وَاللَّهِ لَوْ مَنَعُونِي عَنَاقًا كَانُوا يُؤَدُّونَهَا إِلَى رَسُولِ اللَّهِ ﷺ لَقَاتَلْتُهُمْ عَلَى مَنْعِهَا قَالَ عُمَرُ ؓ فَوَاللَّهِ مَا هُوَ إِلاَّ أَنْ قَدْ شَرَحَ اللَّهُ صَدْرَ أَبِي بَكْرٍ ؓ فَعَرَفْتُ أَنَّهُ الْحَقُّ  

Allah 's Apostle said, " I have been ordered to fight with the people till they say, 'None has the right to be worshipped but Allah,' and whoever says, 'None has the right to be worshipped but Allah,' his life and property will be saved by me except for Islamic law, and his accounts will be with Allah, (either to punish him or to forgive him.)"  

قَالَ رَسُولُ اللَّهِ ﷺ: «أُمِرْتُ أَنْ أُقَاتِلَ النَّاسَ حَتَّى يَقُولُوا لاَ إِلَهَ إِلاَّ اللَّهُ، فَمَنْ قَالَ لاَ إِلَهَ إِلاَّ اللَّهُ فَقَدْ عَصَمَ مِنِّي نَفْسَهُ وَمَالَهُ إِلاَّ بِحَقِّهِ وَحِسَابُهُ عَلَى اللَّهِ۔»  

Messenger of Allah ﷺ said: "I have been ordered (by Allah) to fight against the people until they testify that none has the right to be worshipped but Allah and that Muhammad is Messenger of Allah ﷺ, and offer the prayers perfectly and give the obligatory charity, so if they perform that, then they save their lives and property from me except for Islamic laws and then their reckoning (accounts) will be done by Allah."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ: «أُمِرْتُ أَنْ أُقَاتِلَ النَّاسَ حَتَّى: يَشْهَدُوا أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ، وَيُقِيمُوا الصَّلاَةَ، وَيُؤْتُوا الزَّكَاةَ۔ فَإِذَا فَعَلُوا ذَلِكَ، عَصَمُوا مِنِّي دِمَاءَهُمْ وَأَمْوَالَهُمْ إِلاَّ بِحَقِّ الإِسْلاَمِ، وَحِسَابُهُمْ عَلَى اللَّهِ۔»