Sunan an Nasai
3974
Sahih+2

Abu Hurairah narrated that :The Messenger of Allah [SAW] said: "I have been commanded to fight the people until they say La ilaha illallah, and whoever says it, his life and his wealth are safe from me, except for a right that is due, and his reckoning will be with Allah

SahihAbu Ghuddah
SahihAl-Albani