Superiority of saying: peace be upon the
83) Narrated Abdur-Rahman bin Auf : Allah's Messenger said: Once Jibrael (Gabriel) said to me: Should I tell you something good Allah says to you: Who ever prays for you by saying , I will give him My blessing and mercy and who sends to you greetings, I will sent to him My greetings.
(This Haditn is considered good by others, and reported by Ahmad in his Musnad, Al-Baihaqi and AbO Ya'la).
The remembrance and repetition of (peace and blessing of Allah be upon Muhammad) is highly rewarded and it is one of the causes of the Prophet intercession in the Hereafter. The more you say that the better you deserve the intercession.