Sunan Abi Dawud 3989
سنن أبي داود#3989SahihNarrated Abu Hurairah:The Prophet (ﷺ) as saying - the narrator Isma'il transmitted it from Abu Hurairah, and mentioned the tradition about the coming down of revelation-: "So far (is this the case) that when terror is removed from their hearts
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih Bukhari (4800، 4701)
In-book reference: 32:21