Shia traditional reports on the topic that Imams are twelve in number

H 103 - It is narrated from Ja’far bin Muhammad bin Malik from Muhammad bin Nima Saluli from Wuhaib bin Hafas from Abdullah bin Qasim from Abdullah bin Khalid from Abu Safataj from Jabir bin Yazid from Imam Muhammad Baqir عليه السلام from Jabir bin Abdullah Ansari that he said: ‘I came to Fatima عليه السلام and a tablet was placed before her with names of the successors from her progeny. I counted upto twelve, one of them was Al-Qaim عليه السلام, three were named Muhammad and three were named Ali (peace be on them all).’