From Sahih Bukhari (Hadith 7038):
Narrated `Abdullah:The Prophet (ﷺ) said, "I saw (in a dream) a black woman with unkempt hair going out of Medina and settling at Mahai'a, i.e., Al-Juhfa. I interpreted that as a symbol of epidemic of Medina being transferred to that place (Al-Juhfa)
Reference: Bukhari 7038