´It was narrated from Abu Hurairah that the Prophet (ﷺ) said:` "The first thing for which a person will be brought to account on the Day of Resurrection will be his Salah. If it is found to be complete then it will be recorded as complete, and if anything is lacking He will say: 'Look and see if you can find any voluntary prayers with which to complete what he neglected of his obligatory prayers.' Then the rest of his deeds will be reckoned in like manner."
´It was narrated that Anas bin Malik said:` "When the Messenger of Allah (ﷺ) died, some of the 'Arabs apostatized. 'Umar said: 'O Abu Bakr, how can you fight the 'Arabs? Abu Bakr said: 'The Messenger of Allah (ﷺ) said: I have been commanded to fight the people until they testify that La ilaha illallah (there is none worthy of worship except Allah) and that I am the Messenger of Allah, and establish prayer and pay Zakah?' By Allah, if they withhold from me a small she-goat that they used to give to the Messenger of Allah (ﷺ) I will fight them for withholding it.' ('Umar siad) 'By Allah, when I realized that (Abu) Bakr was confident about this idea, then I knew that this was teh truth.'" Abu 'Abdur-Rahman (An-Nasa'i) said: 'Imran Al Qattan is not strong in Hadith, and this narration is a mistake. The one that is before it is the correct narration of Az-Zuhri, from 'Ubaidullah bin 'Abdullah bin 'Utbah, from Abu Hurairah.
Hadith Referenceسنن نسائي / كتاب الجهاد / 3096
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:صحيح
´It was narrated that Anas bin Malik said:` "When the Messenger of Allah [SAW] died, the 'Arabs apostatized, so 'Umar said: 'O Abu Bakr, how can you fight the 'Arabs?' Abu Bakr said: 'The Messenger of Allah [SAW] said: "I have been commanded to fight the people until they bear witness to La ilaha illallah (there is none worthy of worship except Allah) and that I am the Messenger of Allah, and they establish Salah and pay Zakah." By Allah, if they withhold from me a young goat that they used to give to the Messenger of Allah [SAW], I will fight them for it.' 'Umar said: 'By Allah, as soon as I realized how certain Abu Bakr was, I knew that it was the truth.'"
Hadith Referenceسنن نسائي / كتاب تحريم الدم / 3974
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:حسن
´It was narrated that Jundab bin 'Abdullah said:` "The Messenger of Allah [SAW] said: 'Whoever fights for a cause that is not clear, advocating tribalism, getting angry for the sake of tribalism, then he has died a death of Jahiliyyah.'"
Hadith Referenceسنن نسائي / كتاب تحريم الدم / 4120
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم