Musnad Ahmad 1153:90

Sufyan narrated to us, al-Zuhri narrated to us, from Urwah, from Aisha: Mujazziz al-Mudliji entered upon the Messenger of Allah, may Allah bless him and grant him peace, and he saw Usama and Zayd with a velvet blanket over them, and they had covered their heads, while their feet were exposed. He said: "Indeed, these feet are some from others." And he said once: The Messenger of Allah, may Allah bless him and grant him peace, entered upon me while he was joyful.