Mukhtasar Bukhari

Narrated Abdullah bin Umar (may Allah be pleased with them): The Prophet (peace and blessings of Allah be upon him) said: "I saw (in a dream) as if a black woman with unkempt hair was coming out of Medina and settling at Mahya‘ah (i.e., Al-Juhfa)." (The Prophet (peace and blessings of Allah be upon him) said:) "I interpreted that as the epidemic of Medina being transferred there."