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.
Hadith Referenceصحيح البخاري / كتاب فضائل الصحابة / 3747
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
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