Sunan An-Nasai, Chapter: The Book of the Times (of Prayer)

"The Messenger of Allah (saw) used to pray Asr when the sun was still high and bright, and a person could go to Al-Awali* when the sun was still high." (Sahih) *Al-Awali is the southern-most district of Al-Madinah, and it is very big. Its nearest limit is at a distance of about two miles from the center of Al-Madinah. While its furthest limit is about eight miles.