Musnad Ahmad 1153:2033

Rawh narrated to us, he said: Ibn Jurayj narrated to us, he said: ‘Ata’ informed me that he heard ‘Ubayd ibn ‘Umayr and al-Dahhak. He said: Ibn Jurayj informed us, from ‘Ata’, from ‘Ubayd ibn ‘Umayr, who says: ‘A’ishah informed me that she said regarding the players: "I wished that I could see them." She said: "Then the Messenger of Allah, peace and blessings of Allah be upon him, stood at the door, and I stood behind him, looking between his ears and his shoulder, while they were playing in the mosque." ‘Ata’ said: "A horse or Abyssinians." And Ibn ‘Umayr said: "They were Abyssinians."