Musnad Ahmad 1156:97

Hassan al-Ashyab narrated to us, Ibn Lahi'ah narrated to us, Darraj narrated to us, from al-Sa'ib, the freed slave of Umm Salamah, that some women from the people of Homs entered upon Umm Salamah. She asked them, "From whom are you?" They said, "From the people of Homs." She said, "I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'Any woman who removes her garments in other than her own house, Allah tears away the veil between Him and her.'"