Sunan Abi Dawud 3196
سنن أبي داود#3196SahihNarrated Al-Sha'bi:The Messenger of Allah (ﷺ) passed a grave dug freshly. They arranged a row and uttered four takbirs over it. I asked al-Sha'bi: Who told you ? He replied: A reliable person whom 'Abd Allah b. 'Abbas attended
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 (1247) Sahih Muslim (954)
In-book reference: 21:108