Silsilat al-Ahadith al-Sahihah

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that Sayyiduna Umar bin Khattab (may Allah be pleased with him) came and the Abyssinians were playing in the mosque, so he stopped them. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Umar! Leave them to their state, these are Banu Arfidah (Abyssinian people)."