Mukhtasar Sahih Bukhari — Hadith 2196

Abu Huraira (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The Hour will not be established until a fire emerges from Hijaz which will illuminate the necks of camels in Busra (i.e., the necks of camels will be visible in its light)."