Ra or as radhi allah an or alayhis salaam.
Mu' meneen Brothers and Sisters,
As Salaam Aleikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
One of our brothers/sisters has asked this question:
Should we add (Alaihi salam)after the name of Imam Hussain and Imam Hassan and also with Imam Ali(r.a).I have seen many people write (A.S).
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Ra or as radhi allah an or alayhis salaam
In the name of Allah, We praise Him, seek His help and ask for His forgiveness. Whoever Allah guides none can misguide, and whoever He allows to fall astray, none can guide them aright. We bear witness that there is none worthy of worship but Allah Alone, and we bear witness that Muhammad (saws) is His slave-servant and the seal of His Messengers.
As far as the actually and literal meaning of the term Alayhis Salaam (upon him be peace) is concerned, it is the exact same as the Islamic greeting of Salaam Alaykum (upon you be peace) which the believers are guided to greet one another. Thus if one wishes to say Alayhis Salaam upon one of the noble companions of the Messenger of Allah (saws), there is absolutely no harm in its meaning.
Allah Says in the Holy Quran Chapter 37 Surah Saafaat verse 79:
79 Salaams to Nuh among the nations.
Allah Says in the Holy Quran Chapter 37 Surah Saafaat verse 120:
120 Salaams to Musa and Haaron.
Allah Says in the Holy Quran Chapter 37 Surah Saafaat verse 130:
130 Salaams to such as Elias.
Allah Says in the Holy Quran Chapter 19 Surah Maryam verse 15:
15 So Salaam on him (Prophet Yayha (a.s.)) the day he was born, the day that he dies, and the day that he will be raised up to life (again).
Allah Says in the Holy Quran Chapter 19 Surah Maryam verse 33:
33 So Salaams is on me (Prophet Isa ibn Maryam (a.s.)) the day I was born, the day that I die, and the Day that I shall be raised up to life (again).
Allah Says in the Holy Quran Chapter 27 Surah Naml verse 59:
59 Say: Praise be to Allah and Salaam on His servants whom He has chosen (for his Message).
Because time and time again the Lord Most Gracious has Declared Salaams unto His Prophets in His Glorious Quran, the etiquette adopted by the believers is that when the name of a Prophet of Allah is mentioned in their midst they generally say Alayhis Salaam; and when the name of one of the noble companions of the Last and Final Messenger (saws) is mentioned, they suppicate Radhe-Allaho Ann (May Allah be Pleased with them).
Whatever written of Truth and benefit is only due to Allahs Assistance and Guidance, and whatever of error is of me alone. Allah Alone Knows Best and He is the Only Source of Strength.
Your brother and well wisher in Islam,