Musnad Abu Ya'la al-Mawsili 149:77

Nasr ibn Ali al-Jahdami narrated to us, Muhammad ibn Abd al-Rahman al-Tafawi narrated to us, from Hisham ibn Urwah, from his father, from Aisha, who said: Sawdah was a large-bodied woman. When she would go out, she would tower over the women. Umar ibn al-Khattab saw her and said to her, "Look at how you go out, for by Allah, you are not hidden from us when you go out." Sawdah mentioned that to the Messenger of Allah (may Allah bless him and grant him peace), and in his hand was a piece of meat. He said—and the meat shook in his hand from the terror of the revelation—"Indeed, Allah has granted you permission to go out for your needs."