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. (Using translation from Abū Dāʾūd 5015)
«كَانَ رَسُولُ اللَّهِ ﷺ يَضَعُ لِحَسَّانَ مِنْبَرًا فِي الْمَسْجِدِ يَقُومُ عَلَيْهِ قَائِمًا يُفَاخِرُ عَنْ رَسُولِ اللَّهِ ﷺ» وَيَقُولُ رَسُولُ اللَّهِ ﷺ «إِنَّ اللَّهَ يُؤَيِّدُ حَسَّانَ بِرُوحِ الْقُدُسِ مَا نَافَحَ أَوْ فَاخَرَ عَنْ رَسُولِ اللَّهِ ﷺ»