Sunan Abi Dawud 1386
سنن أبي داود#1386SahihNarrated Mu'awiyah b. Abi Sufyan :The Prophet (ﷺ) as saying: Lailat al-qadr is the twenty-seventh night (of Ramadan)
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 ZaiIsnaad Hasan
In-book reference: 6:16