Chapter 16: The Book of Pilgrimage
Abu Huraira (Allah be pleased with him) reported that Allah' s Messenger (ﷺ) declared sacred the territory between two lava mountains of Medina. Abu Huraira said: If I were to find deer in the territory between the two mountains, I would not molest them, and he (the Holy Prophet) declared twelve miles of suburb around Medina as a prohibited pasture.
Sahih Muslim 1372b