´Narrated Usamah bin Zaid:` "I came to the Prophet (ﷺ) one night concerning some need, so the Prophet (ﷺ) came out while he was covering up something, and I did not know what it was. Once I had tended to my need, I said: 'What is this that you were covering up?' So he uncovered it, and I found it was Hasan and Husain [peace be upon them] upon his hips. So he said: 'These are my two sons, and the sons of my daughter. O Allah! Indeed, I love them, so love them, and love those who love them.'"
Hadith Referenceسنن ترمذي / كتاب المناقب عن رسول الله صلى الله عليه وسلم / 3769
Narrated Usama bin Zaid: That the Prophet used to take him and Al-Hasan, and used to say, "O Allah! I love them, so please love them," or said something similar.
Shaykh Abdul Sattar al-Hammad
Hadith Commentary: In one narration, it is mentioned that Usamah bin Zayd (radi Allahu anhu) says that the Messenger of Allah (sallallahu alayhi wa sallam) would seat me on one thigh and al-Hasan (radi Allahu anhu) on the other, then he would embrace us both and supplicate: “O Allah! Show mercy and kindness to both of them, for I myself show affection to them.” (Sahih al-Bukhari, al-Adab, Hadith: 6003) From this, the virtue of al-Hasan (radi Allahu anhu) becomes evident.
Source: Hidayat al-Qari: Commentary on Sahih Bukhari, Urdu, Page: 3747