It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "I saw (in a dream) a black woman with dishevelled hair come out of Madinah until she stood at Mahya'ah, which is al-Juhfah." Then the Messenger of Allah (peace and blessings be upon him) said: "I interpreted it to mean that the epidemic of Madinah has been moved to al-Juhfah."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13090