Musnad Ahmad 27:1517

Rawh narrated to us, Ibn Jurayj narrated to us, Musa ibn Uqbah narrated to me, from Salim, that he narrated to him regarding the dream of the Messenger of Allah (peace and blessings of Allah be upon him) concerning the epidemic of Medina, from Ibn Umar, from the Prophet (peace and blessings of Allah be upon him), who said: "I saw a black woman with disheveled hair who left Medina until she settled in Mahya'ah," and it is al-Juhfah. The Messenger of Allah (peace and blessings of Allah be upon him) interpreted that the epidemic of Medina had been moved to al-Juhfah.