The Messenger of Allah ﷺ used to setup a pulpit in the mosque for Hassan who would stand on it and satirise those who spoke against the Messenger of Allah ﷺ. The Messenger of Allah ﷺ would say: The spirit of holiness (i.e. Gabriel) is with Hassan so long as he speaks in defence of the Messenger of Allah ﷺ.
كَانَ رَسُولُ اللَّهِ ﷺ يَضَعُ لِحَسَّانَ مِنْبَرًا فِي الْمَسْجِدِ فَيَقُومُ عَلَيْهِ يَهْجُو مَنْ قَالَ فِي رَسُولِ اللَّهِ ﷺ فَقَالَ رَسُولُ اللَّهِ ﷺ إِنَّ رُوحَ الْقُدُسِ مَعَ حَسَّانَ مَا نَافَحَ عَنْ رَسُولِ اللَّهِ ﷺ