Hadith
أَخْبَرَنَا الْقَاسِمُ بْنُ زَكَرِيَّا بْنِ دِينَارٍ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُوسَى، قَالَ حَدَّثَنَا شَيْبَانُ، عَنْ عَاصِمٍ، عَنْ زِيَادِ بْنِ قَيْسٍ، عَنْ أَبِي هُرَيْرَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ " نُقَاتِلُ النَّاسَ حَتَّى يَقُولُوا لاَ إِلَهَ إِلاَّ اللَّهُ فَإِذَا قَالُوا لاَ إِلَهَ إِلاَّ اللَّهُ حَرُمَتْ عَلَيْنَا دِمَاؤُهُمْ وَأَمْوَالُهُمْ إِلاَّ بِحَقِّهَا وَحِسَابُهُمْ عَلَى اللَّهِ " .
It was narrated from Abu Hurairah that :The Messenger of Allah [SAW] said: "We will fight the people until they say La ilaha illallah. If they say La ilaha illallah then their blood and their wealth become forbidden to us, except for a right that is due, and their reckoning will be with Allah
Sahih · Abu Ghuddah
Sunan an-Nasa'i 3978 ·Book 37, Hadith 13·Also available on sunnah.com·