Sahih Bukhari
Interpretation of Dreams
Volume: 009 / Book Number: 087 / Hadith Number: 163
Narrated Salim's father:
The Prophet said, "I saw (in a dream) a black woman with unkempt hair going out of Medina and settling in Mahai'a. I interpreted that as (a symbol of) epidemic of Medina being transferred to Mahai'a, namely, Al-Juhfa."