While the Abyssinians were busy playing with their arms in the presence of the Messenger of Allah ﷺ '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 ﷺ said to him: 'Umar, leave them alone.
بَيْنَمَا الْحَبَشَةُ يَلْعَبُونَ عِنْدَ رَسُولِ اللَّهِ ﷺ بِحِرَابِهِمْ إِذْ دَخَلَ عُمَرُ بْنُ الْخَطَّابِ فَأَهْوَى إِلَى الْحَصْبَاءِ يَحْصِبُهُمْ بِهَا فَقَالَ لَهُ رَسُولُ اللَّهِ ﷺ دَعْهُمْ يَا عُمَرُ