Bulugh al-Maram, Book 9, Hadith 1215 (English)

Ibn ’Umar (RAA) narrated, ‘A young boy was murdered deceitfully. 'Umar (RAA) thereupon said, ‘If all the people of San'a’ (in Yemen) participated in killing him, I would kill them all.’ Related by al-Bukhari.

وَعَنْ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: { قُتِلَ غُلَامٌ غِيلَةً, فَقَالَ عُمَرُ: لَوْ اِشْتَرَكَ فِيهِ أَهْلُ صَنْعَاءَ لَقَتَلْتُهُمْ بِهِ }.‏ أَخْرَجَهُ اَلْبُخَارِيُّ 1‏ ‏1 ‏- صحيح.‏ رواه البخاري (6896)‏ وليس عنده لفظ: "به".‏

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also referenced under: Book 9, Hadith 1185 (In-Book)