Uqbah ibne Haarith narrates: I saw Abu Bakr while he was carrying Hasan (a.s.) and was saying – ‘May my father be sacrificed over you, you are more similar to the Prophet (s.a.w.a.) than to Ali (a.s.)’ while Ali (a.s.) was smiling (at this observation).
Saheeh al-Bukhaari v 5 p 33 Al-Mustadrak Alaa Al-Sahihain v 3 p 168