Aisha radiyallahu anha says, Rasoolullah sallallahu alaihe wasallam would place a mimbar (pulpit) in the Masjid for Hassaan ibn Thaabit, so that he stands upon it and recites poetry on the praises of, and on behalf of Rasoolullah sallallahu alaihe wasallam, or said that he used to defend Rasoolullah sallallahu alaihe wasallam (in reply to the accusation of the kuffar). Rasoolullah sallallahu alaihe wasallam would say, "May Allah assist Hassaan with Ruhul Qudus till he defends, or praises, on behalf of Rasoolullah sallallahu alaihe wasallam."
English reference: Book 36, Hadith 239
Arabic reference: Book 37, Hadith 250