Musnad Ahmad 1153:2083

Uthman ibn Umar narrated to us, he said: Yunus narrated to us, from al-Zuhri, from Urwah, from Aisha, she said: "I have seen the Messenger of Allah, may Allah bless him and grant him peace, standing at the door of my chamber while the Abyssinians were playing with their spears. He would screen me with his cloak so that I could look at their play. Then he would continue to stand until I was the one who turned away."