Musannaf Ibn Abi Shayba 27:216

Waki’ narrated to us, from al-‘Ala’ ibn ‘Abd al-Karim, who said: I heard Mujahid saying: When he said, "I will bring it to you before you rise from your place," he said: I want something faster than this. He said: "The one who had knowledge from the Book said: I will bring it to you before your glance returns to you." He said: So the throne emerged through a tunnel in the earth.