Sunan Abi Dawud 3204
سنن أبي داود#3204SahihNarrated Abu Hurairah:The Messenger of Allah (ﷺ) gave the people news of death of Negus on the day on which he died, took them out to the place of prayer, drew them up in rows and said: "Allah is Most Great" four times
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
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (1245) Sahih Muslim (951)
In-book reference: 21:116