وَحَدَّثَنِي مُحَمَّدُ بْنُ رَافِعٍ، وَعَبْدُ بْنُ حُمَيْدٍ، قَالَ عَبْدٌ أَخْبَرَنَا وَقَالَ ابْنُ رَافِعٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنِ ابْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ بَيْنَمَا الْحَبَشَةُ يَلْعَبُونَ عِنْدَ رَسُولِ اللَّهِ صلى الله عليه وسلم بِحِرَابِهِمْ إِذْ دَخَلَ عُمَرُ بْنُ الْخَطَّابِ فَأَهْوَى إِلَى الْحَصْبَاءِ يَحْصِبُهُمْ بِهَا ‏.‏ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ دَعْهُمْ يَا عُمَرُ.

Abu Huraira reported: While the Abyssinians were busy playing with their arms in the presence of the Messenger of Allah (PBUH) 'Umar b. Khattab came there. He bent down to take up pebbles to throw at them (in order to make them go off). The Messenger of Allah (PBUH) said to him: 'Umar, leave them alone. Translation Not Available

Book Ref: Sahih Muslim Book 8 Hadith 1946
Web Ref:  Sahih Muslim Book 4 Hadith 893