It is narrated from Sayyiduna Sa'id bin Zayd (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) picked up Sayyiduna Hasan (may Allah be pleased with him), then said: 'Allahumma inni uhibbuhu fa-ahibbahu wa ahibba man ahabbahu' "O Allah, I love him, so love him, and love whoever loves him."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Mansur (may Allah have mercy on him) except Ali (may Allah have mercy on him)."
Hadith Referenceالمعجم الأوسط / باب الألف / 1349
Hadith Takhrij«أخرجه أبو يعلى فى «مسنده» برقم: 960، والبزار فى «مسنده» برقم: 1273، وابن حجر فى «المطالب العالية» برقم: 3960 / 1، 3960 / 2، والطبراني فى «الكبير» برقم: 351، 2581»