Abu Hurairah (RA) reported: I went along with Allalh's Messenger (ﷺ) at a time during the day but he did not talk to me and I did not talk to him until he reached Bazar of Bani Qainuqa'. He came back to the tent of Fatima and said: Is the little chap (meaning Hasan) there? We were under the impression that his mother had detained him in order to bathe him and dress him and garland him with a sweet garland. Not much time had passed that he (Hasan) came running until both of them embraced each other, thereupon Allah's Messenger (ﷺ) said: O Allah, I love him; love him Thou and love one who loves him (Hasan).
Hadith Referenceصحيح مسلم / كتاب فضائل الصحابة / 2421
Al-Bara' bin Azib (RA) reported: I saw Hasan bin 'Ali upon the shoulders of Allah's Apostle (ﷺ) and he was saying: O Allah, I love him, and love him Thou.
Hadith Referenceصحيح مسلم / كتاب فضائل الصحابة / 2422
Al-Bara' b. Azib reported: I saw the Messenger of Allah (صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ) with Al-Hasan b. 'Ali placed upon his shoulders and he was saying: O Allah, I love him, and love him Thou.
Hadith Referenceصحيح مسلم / كتاب فضائل الصحابة / 2422
Iyas reported on the authority of his father: I (had the honour of) leading the white mule on which rode Allah's Apostle (ﷺ) and with him were Hasan and Husain, till it reached the apartment of Allah's Apostle (ﷺ) . The one amongst them was seated before him and the other one was seated behind him.
Hadith Referenceصحيح مسلم / كتاب فضائل الصحابة / 2423