Musnad Ahmad 1294:1

'Abd al-Rahman ibn Mahdi narrated to us, from Sufyan, from Habib—meaning Ibn Abi Thabit—from a man, from Umm Muslim al-Ashja'iyyah, that the Prophet, peace and blessings of Allah be upon him, came to her while she was in a tent and said: "How beautiful it is, if there were no dead thing in it." She said: So I began to search for it.