Holy Prophet (s.a.w.a.) said to Hazrat Ali (s.a.), ‘O Ali, surely these two children (i.e. Imam Hasan (a.s.) and Imam Husain (a.s.)) have distracted me from loving anyone other than them. Surely my Lord has commanded me to love both of them and to love the one who loves them both.
Kaamil al-Ziyaraat v 1 p 50