Musnad Abu Ya'la al-Mawsili 149:66

Ishaq narrated to us, Sufyan narrated to us, from al-Zuhri, from Urwah, from Aisha, who said: The Messenger of Allah (may Allah bless him and grant him peace) entered upon me one day, happy, saying: "O Aisha, have you not seen that Mujazziz al-Mudliji entered upon me and saw Usamah and Zayd, with a velvet blanket over them, having covered their heads while their feet were exposed? He said: 'Indeed, these feet are some from others.'"