Imam Al-Sadiq (pbuh) said:” Allah Al-Mighty has a shrine in Makka, the Messenger of Allah(pbuh) has a shrine in Al-Madina, Ameer El-Mo’mineen (pbuh) has a shrine in Al-Kufa, and Qum is the
small Kufa. Heaven has eight doors, three of them are in Qum. There will be a women of my descendents who will die there. Her name is Fatima Bint Moussa (pbut) and my Shia would all enter heaven
by her intercession.
Imam al-Sādiq (pbuh) has said: “A lady from my children, by the name of Fatima will be buried in Qom . Whoever visits her [shrine], will certain
Imam Al-Rida (pbuh) said about Sayyida Fatima Al-Ma’asouma :”He who visits her, knowing her right, shall enter Heaven.”
Mostadrak Al-Wasa'il vol.10 p.369, Al-Bihar vol.48 p.317
Imam Muhammad Taqī al-Jawād (A) said: “He who visits my aunt [Lady Fatima Maasouma (A)] in Qom , shall enter Heaven.”
Wasa'el Al-Shia vol.14 p.576, Al-Bihar vol.73 p.316, Kamil Al-Ziarat p.324