Evidence of the Imamate of Imam Musa Kadhim عليه السلام and refutation of Waqifiya

H 33 - Ja’far bin Samaa-a has narrated from Muhammad bin Hasan from his father, Hasan bin Harun that Imam Ja’far Sadiq عليه السلام said: This son of mine, that is Abul Hasan (Musa), is the Qaim and this is an inevitable matter and he would fill the earth with justice and equity just as it would have been fraught with injustice and tyranny.