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

H 104 - A group of scholars informed me that Muhammad bin Yaqub narrates from Ali bin Ibrahim bin Hashim from his father from Ibn Umair from Saeed bin Ghazwan from Abu Basir from Imam Muhammad Baqir عليه السلام that he said: “After Husain عليه السلام, there will be nine Imams. The ninth of them is their Qaim.”