(21) باب إِذَا أَصَابَ قَوْمٌ مِنْ رَجُلٍ هَلْ يُعَاقِبُ أَوْ يَقْتَصُّ مِنْهُمْ كُلِّهِمْ
Ibn 'Umar said:
A boy was assassinated. 'Umar said, "If all the people of San'a 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, Ibn 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 last and for scratching.
Reference: Sahih al-Bukhari 6896
In-book reference: Book 87, Hadith 35
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 83, Hadith 34