Hadith is about Visiting the Sick or Dying

Umm Salamah RA: The Messenger of Allah (sallallaahu ’alayhi wa sallam) said, "When you visit a sick or a dying person, you should utter good words because the angels say `Amin' at what you say." She added: When Abu Salamah RA died, I came to the Prophet (sallallaahu ’alayhi wa sallam) and said: "O Messenger of Allah, Abu Salamah has died." He (sallallaahu ’alayhi wa sallam) directed me to supplicate thus: "Allahummaghfir li wa lahu, wa a`qibni minhu `uqba hasanatan [O Allah, forgive me and him, and bestow upon me a better future (give me a better substitute)]." So I supplicated as he directed, and Allah gave me a man who was better for me than Abu Salamah (i.e., the Prophet Muhammad (sallallaahu ’alayhi wa sallam)). (The Prophet (sallallaahu ’alayhi wa sallam) married Umm Salamah afterwards. (Muslim)