Sahih Bukhari Volume 9, Book 87, Hadith 6898

وَقَالَ لِي ابْنُ بَشَّارٍ حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ غُلاَمًا، قُتِلَ غِيلَةً فَقَالَ عُمَرُ لَوِ اشْتَرَكَ فِيهَا أَهْلُ صَنْعَاءَ لَقَتَلْتُهُمْ‏.‏ وَقَالَ مُغِيرَةُ بْنُ حَكِيمٍ عَنْ أَبِيهِ إِنَّ أَرْبَعَةً قَتَلُوا صَبِيًّا فَقَالَ عُمَرُ مِثْلَهُ‏.‏ وَأَقَادَ أَبُو بَكْرٍ وَابْنُ الزُّبَيْرِ وَعَلِيٌّ وَسُوَيْدُ بْنُ مُقَرِّنٍ مِنْ لَطْمَةٍ‏.‏ وَأَقَادَ عُمَرُ مِنْ ضَرْبَةٍ بِالدِّرَّةِ‏.‏ وَأَقَادَ عَلِيٌّ مِنْ ثَلاَثَةِ أَسْوَاطٍ‏.‏ وَاقْتَصَّ شُرَيْحٌ مِنْ سَوْطٍ وَخُمُوشٍ‏.‏

Ibn Umar said: A boy was assassinated.Umar said, "If all the people of Sana took part in the assassination I would kill them all." Al-Mughira bin Hakim said that his father said, "Four persons killed a boy, and Umar said(as above)." Abu Bakr Az Zubair, Ali and Suwaid bin Muqarrin gave the judgement of Al-Qisas (equality in punishment) in cases of slapping. And Umar carried out Al-Qisas for a strike with a stick.And Ali carried out Al-Qisas for three lashes with a whip. And Shuraih carried out for one lash and for scratching.