Musnad Abu Ya'la al-Mawsili 209:93

Abu Khaythama narrated to us, Abd al-Rahman narrated to us, from Sufyan, from Habib, from Wahb, the freed slave of Abu Ahmad, from Umm Salamah: That the Prophet, may Allah bless him and grant him peace, entered upon her while she was covering her head (with a khimar). He said: "Twist it, or twist it twice."