Salawat on the Holy Prophet (peace be upon Him)
1133. It is Mustahab that whenever a person hears or utters the sacred name of the holy Prophet of Islam like, Mohammad or Ahmad (peace be upon Him), or his title like, Mustafa or his patronymic appellation like Abul Qasim, he should recite Salawat (i.e. Allahumma salli ‘Ala Mohammadin wa Aali Mohammad), even if that happens during the Namaz, it is Mustahab to recite Salawat.
1134. It is Mustahab that after writing the sacred name of the holy Prophet (peace be upon him), Salawat also be written with it. And it is better that whenever one remembers him, should send Salawat on him.