Muhammad b. `Ali Majiluwayh narrated to us. He said: Muhammad b. Yahya al-`Attar narrated to us. He said: Muhammad b. Ahmad b. Yahya b. `Imran al-Ash`ari narrated to us from `Isa b. Muhammad from `Ali b. Mahziyar from `Abdullah b. `Umar from `Abdullah b. Hammad from Abi `Abdillah al-Sadiq . He said:

When Dhul Qarnayn completed the wall, he passed it and entered the shade. Then, he found himself ruling over a mountain that was five hundred cubits in height. So, an angel said to him: “O Dhul Qarnayn! Was there not a path behind you?” So, Dhul Qarnayn said to him: “Who are you?” He said: “I am an angel from the angels of the Merciful. I was assigned to this mountain. There is not a mountain in the creation of Allah that does not have a vein that connects to this mountain. Whenever Allah decides to send an earthquake to a city, He reveals [the command] to me, and I send an earthquake to it.