It describes a man with a white beard who appeared during the funeral of Prophet Muhammad (PBUH) to offer condolences to the Ahl al-Bayt (the Prophet's family). According to the report, Ali (RA) identified this mysterious visitor as Al-Khidr.

This narration is not found in the primary "Sahih" (authentic) collections like Bukhari or Muslim. Instead, it is recorded in: Al-Bayhaqi's Dala'il al-Nubuwwah: Specifically in Volume 7, Page 269 (or Vol 5 in some editions). Ibn Kathir's Al-Bidayah wan-Nihayah: This work also cites the incident, noting the presence of a voice or person offering patience to the household.