"The Messenger of Allah said: 'I have been commanded to fight the people until they say La ilaha illallah. If they say it, then their blood and wealth are prohibited for me, except for a right that is due, and their reckoning will be with Allah, the Mighty and Sublime."
Sunan an-Nasa'i Book 37, Hadith 11
← Previous Hadith "So Abu Bakr decided to fight them, then 'Umar said: 'O Abu Bakr, how can you fight the people when the Messenger of Allah , I will fight them for withholding it.' 'Umar said: 'By Allah, as soon as I realized that Allah has expanded the chest of Abu Bakr to fight them, I knew that it was the truth.'"

Sunan an-Nasa'i Book 37, Hadith 10 Next Hadith → "The Messenger of Allah said: 'I have been commanded to fight the people until they say La ilaha illallah. If they say it, then their blood and wealth are prohibited for me, except for a right that is due, and their reckoning will be with Allah.'"

Sunan an-Nasa'i Book 37, Hadith 12