Abu Dawud
General Behavior
Book Number: 036 / Hadith Number: 4997
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).