It is Not Permissible to distinguish 'Ali with the Invocation 'Alaihis -Salam' (peace be upon him)
Question:
I was looking through the subjects covered in the book 'Aqd Ad-Durar fee Akhbar Al-Muntathar'... in some of the narrations attributed to 'Ali bin Abi Talib, may Allah be pleased with him, I find that they are written thus: "It is reported on the authority of 'Ali bin Abi Talib 'Alaihis- Salam (upon him be peace) that Allah's Messenger SAW said:
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What is the ruling on using this expression, I mean: 'Alaihis- Salam (upon him be peace) o the like for other than the Messenger of Allah?
Answer:
It is not appropriate to distinguish 'Ali with this saying. Rather, what is legislated is that it be said in his case and the case of other Companions: Radhi Allahu Anhu (may Allah be pleased with him), Radhi Allahu Anhum (may Allah be pleased with them) or: Rahimahullah (may Allah have mercy on him). This is because there is no evidence for distinguishing him by it. Likewise is the expression used by some: Karram Allahu Wajhahu (may Allah bless his countenance), there is no evidence for using it, nor is there any reason to distinguish him by it. It is best to treat him the same as the rest of the Well- Guided Caliphs and not to apply any special words to him which are not applied to the others, when there is no evidence to support it.
Source:
Fatawa Islamiyah, Vol. 1 Pages 113-114