Abu Dawud Book 36, Hadith Number 4997.
Chapter : Not known.
Narated By ‘Aisha, Ummul Mu’minin : The Apostle of Allah (PBUH) used to setup a pulpit in the mosque for Hassan who would stand on it and satirise those who spoke against the Apostle of Allah (PBUH). The Apostle of Allah (PBUH) would say: The spirit of holiness (i.e. Gabriel) is with Hassan so long as he speaks in defence of the Apostle of Allah (PBUH).