I saw the Prophet ﷺ placing Hasan bin Ali on his shoulder, saying, "Allah, I love him, so love him."
حدثنا محمد بن بشار حدثنا محمد بن جعفر حدثنا شعبة عن عدي بن ثابت قال سمعت
رأيت النبي ﷺ واضعا الحسن بن علي على عاتقه وهو يقول اللهم إني أحبه فأحبه
Agreed upon. Bukhari narrated it in "Virtues of the Companions of the Prophet," chapter on the merits of Hasan and Husayn , hadith no. 3749, and Muslim, hadith no. 2422, from the hadith of Shubah with the same wording.