Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 3153
Jabir (Allah be pleased with him) reported Allah's Apostle (may peace be upon him) as saying: Ibrahim declared Mecca as sacred; I declare Medina, that between the two mountains, as inviolable. No tree should be lopped and no game is to be molested.