The Fiqh of Sending Peace & Blessings on the Prophet صلى الله عليه وآله وسلم
"Imam Haskafi mentions in his Durr al-Mukhtar concerning sending the peace and blessings on the prophet (Allah bless him and give him peace),
“It is obligatory once in a persons life, without any difference of opinion…and it is differed upon concerning it's necessity every time he is mentioned (Allah bless him and give him peace) the chosen opinion according to Tahawi is that it is necessary (wajib) every time he is mentioned and the opinion of the school is that repeating it is recommended [f: that is, saying it once in a session is necessary, and repeating it every time the Prophet’s name is mentioned is recommended].”
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