Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates: When the Prophet (peace and blessings be upon him) came (to Madinah), our practice was that when death approached one of us, we would inform him. He would come and seek forgiveness for him, until, when he passed away, he and his companions would return; and sometimes he had to remain there until the burial, which took a long time. When we felt that this caused hardship for the Prophet (peace and blessings be upon him), we said to one another that we should not inform him until someone's soul had been taken, and inform him once the soul had been taken, so that he would not be troubled with hardship and waiting. So after that, we would inform him after someone had died, and he would come and lead the funeral prayer over him. This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.