Al-Adab Al-Mufrad, Book 5, Hadith 86 (English) ⓘ
Al-Bara' said, "I saw the Prophet, may Allah bless him and grant him peace, when al-Hasan was on his shoulder. He was saying, 'O Allah, I love him, so love him.'"
حَدَّثَنَا أَبُو الْوَلِيدِ، قَالَ: حَدَّثَنَا شُعْبَةُ، عَنْ عَدِيِّ بْنِ ثَابِتٍ قَالَ: سَمِعْتُ الْبَرَاءَ يَقُولُ: رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم وَالْحَسَنُ صَلَوَاتُ اللهِ عَلَيْهِ عَلَى عَاتِقِهِ، وَهُوَ يَقُولُ: اللَّهُمَّ، إِنِّي أُحِبُّهُ فَأَحِبَّهُ.
also referenced under: Hadith 86 (Reference) & Book 5, Hadith 3 (In-Book)