Sunan Abi Dawud 1385
سنن أبي داود#1385SahihNarrated Ibn 'Umar:The Messenger of Allah (ﷺ) as saying: Seek lailat al-qadr in the last seven days
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 Muslim (1165)
In-book reference: 6:15