Sahih al-Bukhari 6055
صحيح البخاري#6055SahihNarrated Ibn `Abbas:Once the Prophet (ﷺ) went through the grave-yards of Medina and heard the voices of two humans who were being tortured in their graves. The Prophet (ﷺ) said, "They are being punished, but they are not being punished because of a major sin, yet their sins are great. One of them used not to save himself from (being soiled with) the urine, and the other used to go about with calumnies (Namima)." Then the Prophet asked for a green palm tree leaf and split it into two pieces and placed one piece on each grave, saying, "I hope that their punishment may be abated as long as these pieces of the leaf are not dried
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 78:85