Ja'far al-Sadiq
The other (less probable) reason for the creation of the Waqifites’ beliefs is that Musa’s father, Ja'far al-Sadiq (the 6th Imam), reported many traditions concerning the occultation and the rise of al-Qa'im, but did not indicate explicitly which of his descendants would be al-Qa'im. Therefore, a considerable number of the muhaddithun thought that Ja'far al-Sadiq had indicated his son Musa and hence stopped at him, contending that he was the Mahdi and was in a state of occultation.