The Messenger of Allah [SAW] said: "Whoever unsheathes his sword and starts to strike the people with it, it is permissible to shed his blood." (Using translation from Nasāʾī 4097)
قَالَ رَسُولُ اللَّهِ ﷺ «مَنْ شَهَرَ سَيْفَهُ ثُمَّ وَضَعَهُ فَدَمُهُ هَدَرٌ»