Sahih al-Bukhari 2902

It is related from Abu Dharr that the Prophet, may Allah bless him and grant him peace, asked Abu Dharr when the sun set, "'Do you know where it goes?" He replied, "Allah and His Messenger know best." He said, "It goes until it prostrates under the Throne. Then it asks permission and is given permission. It is nearly the time when it will prostrate and it will not be accepted from it, and it will ask permission and will not be given permission. It will be told, 'Go back from whence you came,' and it will rise in the west. That is the words of Allah Almighty, 'And the sun runs to its resting place. That is the decree of the Almighty, the All-Knowing.' (36:38)"