That the Prophet ﷺ used to take him and Al-Hasan, and used to say, "O Allah! I love them, so please love them," or said something similar.
عَنِ النَّبِيِّ ﷺ أَنَّهُ كَانَ يَأْخُذُهُ وَالْحَسَنَ وَيَقُولُ اللَّهُمَّ إِنِّي أُحِبُّهُمَا فَأَحِبَّهُمَا أَوْ كَمَا قَالَ
That the Prophet ﷺ used to take him (i.e. Usama) and Al-Hassan (in his lap) and say: "O Allah! Love them, as I love them."
عَنِ النَّبِيِّ ﷺ أَنَّهُ كَانَ يَأْخُذُهُ وَالْحَسَنَ فَيَقُولُ اللَّهُمَّ أَحِبَّهُمَا فَإِنِّي أُحِبُّهُمَا
O Allah, behold, I love him. Thou too love him and love one who loves him.
عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ لِحَسَنٍ اللَّهُمَّ إِنِّي أُحِبُّهُ فَأَحِبَّهُ وَأَحْبِبْ مَنْ يُحِبُّهُ
that the Prophet ﷺ saw al-Ḥasan and al-Ḥusayn, so he said: "O Allah, I love them, so love them."
أَنَّ النَّبِيَّ ﷺ أَبْصَرَ حَسَنًا وَحُسَيْنًا فَقَالَ: «اللَّهُمَّ إِنِّي أُحِبُّهُمَا فَأَحِبَّهُمَا.»
[Machine] The Messenger of Allah ﷺ said: "O Allah, indeed I love them, so make them love one another."
قَالَ رَسُولُ اللهِ ﷺ اللهُمَّ إِنِّي أُحِبُّهُمَا فَأَحِبَّهُمَا
[Machine] He informed me that he saw the Prophet ﷺ hugging Hasan and Husayn and saying, "O Allah, I love them, so love them."
أَخْبَرَهُ أَنَّهُ رَأَى النَّبِيَّ ﷺ يَضُمُّ إِلَيْهِ حَسَنًا وَحُسَيْنًا يَقُولُ اللهُمَّ إِنِّي أُحِبُّهُمَا فَأَحِبَّهُمَا
[Machine] The Prophet ﷺ used to take me and Al-Hasan bin Ali and would say, "O Allah, love them, for I love them."
كَانَ رَسُولُ اللهِ ﷺ يَأْخُذُنِي وَالْحَسَنَ بْنَ عَلِيٍّ فَيَقُولُ «اللهُمَّ أَحِبَّهُمَا فَإِنِّي أُحِبُّهُمَا»
That the Prophet ﷺ used to take him (i.e. Usama) and Al-Hassan (in his lap) and say: "O Allah! Love them, as I love them." (Using translation from Bukhārī 3735)
كَانَ رَسُولُ اللهِ ﷺ يَأْخُذُ بِيَدِي وَيَدِ الْحَسَنِ فَيَقُولُ «اللهُمَّ إِنِّي أُحِبُّهُمَا فَأَحِبَّهُمَا»
"كَانَ النَّبِىُّ ﷺ يَأخُذُ بِيَدِى وَبِيَدِ الْحَسَنِ وَيَقُولُ: اللَّهُمَّ أَحِبَّهُمَا فَإِنِّى أُحِبُّهُمَا".