Sending blessings and peace upon the Prophets, and praying for Allah’s pleasure, mercy and safety for others
Question

                What is customary is for us to say “Blessings and peace of Allah be upon him (sall Allahu ‘alayhi wa sallam)” specifically for our Prophet Muhammad (blessings and peace of Allah be upon him); is it permissible to offer this supplication with this wording for other Prophets? Who are the only ones for whom the following phrases are to be used: may Allah be pleased with him (radiya Allahu ‘anhu), may Allah have mercy on him (rahimahu Allah), may Allah keep him safe (sallamahu Allah)? Is it permissible to offer supplication for a great scholar who strove all his life to call people to Allah and His Messenger, such as Shaykh ‘Abd al-‘Azeez ibn Baaz and other, similar contemporary scholars, when they die, by saying “may Allah be pleased with him” or “peace be upon him”?
Praise be to Allah.
    
    Firstly: 

    
    Offering supplication by saying “Blessings and peace of Allah be upon him (sall 
    Allahu ‘alayhi wa sallam)” is not only for our Prophet Muhammad (blessings 
    and peace of Allah be upon him); rather it may be said for all the Prophets 
    (blessings and peace be upon them). 

    
    Secondly: 

    
    With regard to offering supplication by saying “may Allah be pleased with 
    him (radiya Allahu ‘anhu)”, the scholars have determined that this 
    du‘aa’ is typically for the Sahaabah (may Allah be pleased with them), but 
    if a person occasionally prays for some other Muslim by saying this, there 
    is nothing wrong with that. 

    
    Thirdly: 

    
    Saying “may Allah have mercy on him (rahimahu Allah)”, “may Allah 
    keep him safe (sallamahu Allah)” is a supplication that it is prescribed to 
    offer for any Muslim, living or deceased. 

    
    And Allah is the source of strength; blessings and peace of Allah be upon 
    Prophet Muhammad and his family and companions. End quote. 

    
    Standing Committee for Academic Research and Issuing Fatwas 

    
    Shaykh ‘Abd al-‘Azeez ibn ‘Abdullah Aal ash-Shaykh, Shaykh ‘Abdullah ibn 
    Ghadyaan, Shaykh Saalih al-Fawzaan, Shaykh Bakr Abu Zayd.