Musnad Ahmad 1290:2

'Abd al-Razzaq narrated to us, Ma'mar informed us, from al-Zuhri, from Kharijah ibn Zayd, who said: Umm al-'Ala' al-Ansariyyah used to say: When the Emigrants (Muhajirun) arrived in Medina, the Helpers (Ansar) drew lots for their housing, and 'Uthman ibn Maz'un fell to us in the housing. She then mentioned the hadith, except that he (the Prophet) said: "I do not know, while I am the Messenger of Allah, what will be done with me or with you."