Hadith-Qom, the sanctuary of the Ahl al-Bayt (alayhim as-salam) in the hadith from Al-Imam Ja'far ibn Muhammad al-Sadiq (alayhi as-salam)
Imam Ja'far ibn Muhammad al-Sadiq (alayhi as-salam)إِنَّ لِلَّهِ حَرَماً وَ هُوَ مَكَّةُ وَ لِرَسُولِهِ حَرَماً وَ هُوَ الْمَدٖینَةُ وَ لِأَمٖیرِ الْمُؤْمِنٖینَ حَرَماً وَ هُوَ الْكُوفَةُ وَ لَنَا حَرَماً وَ هُوَ قُمُّ وَ سَتُدْفَنُ فٖیهِ اِمْرَأةٌ مِنْ وُلْدِی تُسَمّٖى فاطِمَةُ مَنْ زَارَهَا وَجَبَتْ لَهُ الْجَنَّةُ. (قَالَ الرَّاوٖی وَ کانَ هَذَا الْکلَامُ مِنْهُ قَبْلَ أَنْ یولَدَ الْکاظِمُ(عليه السلام)؛) Indeed, Allah has a sanctuary and it is Mecca, and Rasul Allah Muhammad (salla Allahu alayhi wa aalihi wa sallam) has a sanctuary and it is Medina, and the Amir al-Mu'minin Imam Ali (alayhi as-salam) has a sanctuary and it is Kufa, and we have a sanctuary and it is Qom, and a woman from my offspring called Fatimah (salaamullahi alayha) will be buried in it; whoever visits her, Paradise becomes incumbent for him.
(The narrator said: and this statement was from Imam Ja'far ibn Muhammad al-Sadiq (alayhi as-salam) before Al-Imam Musa ibn Jaafar al-Kazim (alayhi as-salam) was born.)
Bihar al-Anwar, Vol 60, page 216 Imam Ja'far ibn Muhammad al-Sadiq (alayhi as-salam)Sayyida Fatimah al-Ma'sumah bint Musa al-Kadhim (salaamullahi alayha)Al-Imam Musa ibn Jaafar al-Kazim (alayhi as-salam)Hadith