Sunan Abi Dawud 5248
سنن أبي داود#5248SahihNarrated AbuHurayrah: The Prophet (ﷺ) said: We have not made peace with them since we fought with them, so he who leaves any of them alone through fear does not belong to us
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan Sahih
Muhammad Muhyi Al-Din Abdul HamidHasan Sahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 43:476