Muhammad ibn Al-Hassan ibn Ahmad ibn al-Waleed – may God be pleased with him – narrated that Muhammad ibn Al-Hassan al-Saffar and Sa’d ibn Abdullah quoted on the authority of Ahmad ibn Muhammad ibn Isa, on the authority of Al-Hassan ibn Ali ibn Yaqteen, on the authority of his brother Al-Hussein, on the authority of his father Ali ibn Yaqteen,
“Harun Ar-Rashid was looking for someone who could make fun of Abil Hassan Musa ibn Ja’far (as), belittle him and defeat him in arguments in a meeting. A magician volunteered to do so. When they spread the table to eat, the magician put a spell on the bread so that whenever Abul Hassan (as) wanted to grab a piece of bread to eat, it would fly away from his hands. Harun was very pleased and laughed a lot at this.
Then Abul Hassan (as) turned to the picture of a lion which was on a portrait and said, “O Lion! Seize this enemy of God!” The narrator of the tradition added, “Then the picture of the lion turned into a big lion, jumped on the magician, and tore him up.” Then Harun and all his companions who were present were watching got scared, fainted and fell down. When they regained consciousness, Harun told Abil Hassan (as), “I beg you by the right I have over you to ask the picture to return that man.” Then the Imam (as) said, “If the Cane of Moses (as) returned the canes and the ropes which it swallowed, this picture will also return that man.”
The narrator of this tradition added, “This was one of the most important reason why Imam (as) was martyred.”
[Source: Uyoon akhbar ur raza, Vol 1, Chapter 8, Pg.95,96]
This narration clearly shows the authority of Imam (as) over creation, life and death.
source: Marefate AhleBait(as).com
source : sibtayn