Sayyiduna Abdullah (bin Mas'ud) (may Allah be pleased with him) said: the Prophet (peace and blessings be upon him) was praying while Sayyiduna Hasan and Sayyiduna Husayn were on his back. The people wanted to move them away, so the Prophet (peace and blessings be upon him) said: "Leave them, may my father and mother be ransomed for them! Whoever loves me, let him love these two as well."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2631