Sahih Bukhari Volume 9, Book 92, Hadith Number 429.

Narrated By Anas bin Malik : Allah’s Apostle used to perform the ‘Asr prayer and then one could reach the ‘Awali (a place in the outskirts of Medina) while the sun was still quite high.

Narrated Yunus: The distance of the ‘Awali (from Medina) was four or three miles.