Reward of Ziyarat of Holy Prophet (s), Imam Ali, Imam Hasan, Imam Hussain and the other Imams (p.b.u.t)

1. Imam Jafar as-Sadiq (a.s) narrates from his predecessors that Imam Hasan (a.s) asked the Holy Prophet (saw), "O Father! what is the reward of your ziyarat?" He (saw) replied, "One who performs my ziyarat, your father and your brother, it is obligatory for me to do his ziyarat on the day of judgment and free him from sins."

2. Imam Muhammad Baqir (a.s) narrates from his predecessors that Imam Hussain (a.s) asked the Holy Prophet (saw) "O father! what is the reward of a person who does our ziyarat?" He (saw) replied, "One who does my ziyarat, your father and your brother, it is obligatory for me to visit him on the day of judgment, free him from sins and make him enter paradise."
Ref: Sawaabul A'amaal