Musnad Ahmad

It is narrated from Sayyiduna Abbas (may Allah be pleased with him) that once we were sitting with the Prophet (peace and blessings be upon him) in the valley of Batha when a cloud passed by. The Prophet (peace and blessings be upon him) said: "Do you know what this is?" We said: It is called sahab (cloud). He said: "Is it also called muzn?" We said: Yes, it is also called muzn. Then he said: "Is it also called 'anan?" At this, we remained silent. Then he said: "Do you know what the distance is between the sky and the earth?" We said: Allah and His Messenger know best. He said: "The distance between the sky and the earth is five hundred years, and likewise, the distance between each heaven and the next is five hundred years, and the thickness of each heaven is five hundred years. Then above the seventh heaven is a sea, the surface and depth of which is the distance between the earth and the sky. Then above that are eight mountain goats, the distance between their knees and hooves is as much as the distance between the earth and the sky. Then above that is the Throne ('Arsh), the distance between its upper and lower parts is as much as the distance between the earth and the sky. And above all is Allah, Blessed and Exalted, from whom no deed of the children of Adam is hidden."