أَخْبَرَنَا أَبُو دَاوُدَ، قَالَ حَدَّثَنَا أَبُو عَاصِمٍ، عَنِ ابْنِ جُرَيْجٍ، عَنِ ابْنِ طَاوُسٍ، عَنْ أَبِيهِ، عَنِ ابْنِ الزُّبَيْرِ، قَالَ مَنْ رَفَعَ السِّلاَحَ ثُمَّ وَضَعَهُ فَدَمُهُ هَدَرٌ ‏.‏

It was narrated that Ibn Az-Zubair said: "Whoever wields a weapon and starts to strike (the people) with it, it is permissible to shed his blood." Translation Not Available

Book Ref: Sunan An Nisai Book 37 Hadith 4099
Web Ref:  Sunan An Nisai Vol 5 Book 37 Hadith 4104