Jami` at-Tirmidhi 2606
جامع الترمذي#2606SahihNarrated Abu Hurairah:narrated that the Messenger of Allah (ﷺ) said: "I have been ordered to fight the people until they say La Ilaha Illallah", and if they say that, then their blood and wealth will be protected from me, except what it makes obligatory upon them, and their reckoning is up to Allah
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih Mutawatir
Al-AlbaniSahih Mutawatir
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Bukhari And Muslim
In-book reference: 40:1