Sahih al-Bukhari 3746
Narrated Abu Bakra:
I heard the Prophet (ﷺ) talking at the pulpit while Al-Hasan was sitting beside him, and he (i.e. the 
Prophet ) was once looking at the people and at another time Al-Hasan, and saying, "This son of mine 
is a Saiyid (i.e. chief) and perhaps Allah will bring about an agreement between two sects of the 
Muslims through him."
حَدَّثَنَا صَدَقَةُ، حَدَّثَنَا ابْنُ عُيَيْنَةَ، حَدَّثَنَا أَبُو مُوسَى، عَنِ الْحَسَنِ، سَمِعَ أَبَا بَكْرَةَ، سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم عَلَى الْمِنْبَرِ وَالْحَسَنُ إِلَى جَنْبِهِ، يَنْظُرُ إِلَى النَّاسِ مَرَّةً وَإِلَيْهِ مَرَّةً، وَيَقُولُ ‏
"‏ ابْنِي هَذَا سَيِّدٌ، وَلَعَلَّ اللَّهَ أَنْ يُصْلِحَ بِهِ بَيْنَ فِئَتَيْنِ مِنَ الْمُسْلِمِينَ ‏"‏‏.‏