Sahih Bukhari
Pilgrimmage (Hajj)
Volume: 002 / Book Number: 026 / Hadith Number: 699
Narrated Ibn Umar:
Al Abbas bin Abdul-Muttalib asked the permission of Allahs Apostle to let him stay in Mecca during the nights of Mina in order to provide the pilgrims with water to drink, so the Prophet permitted him.