Mishkat al-Masabih #3341
Retaliation
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ: أَنَّ عُمَرَ بْنَ الْخطاب قَتَلَ نَفَرًا خَمْسَةً أَوْ سَبْعَةً بِرَجُلٍ وَاحِدٍ قَتَلُوهُ قَتْلَ غِيلَةٍ وَقَالَ عُمَرُ: لَوْ تَمَالَأَ عَلَيْهِ أَهْلُ صَنْعَاءَ لَقَتَلْتُهُمْ جَمِيعًا. رَوَاهُ مَالِكٌ
وروى البُخَارِيّ عَن ابْن عمر نَحوه
Sa'id b. al-Musayyib told that ‘Umar b. al-Khattab killed five or seven people for one man whom they had killed treacherously, ‘Umar saying. “If the people of San'a’ had conspired against him I would have killed them all.”
Malik transmitted it, and Bukhari transmitted something similar on the authority of Ibn ‘Umar.
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About Mishkat al-Masabih
This hadith is #3341 from Mishkat al-Masabih, in the Book of Retaliation.