I saw the Messenger of Allah ﷺ with Al-Hasan b. 'Ali placed upon his shoulders and he was saying: O Allah, I love him, and love him Thou. (Using translation from Muslim 2422b)
رَأَيْتُ رَسُولَ اللهِ ﷺ حَامِلًا الْحَسَنَ بْنَ عَلِيٍّ ؓ عَلَى عَاتِقِهِ وَهُوَ يَقُولُ «اللهُمَّ إِنِّي أُحِبُّ حَسَنًا فَأَحِبَّهُ»