The Messenger of Allah ﷺ said, "Whoever unsheathes his sword and then strikes with it, his blood is forfeit."
أخبرنا إسحق بن إبراهيم قال أنبأنا عبد الرزاق بهذا الإسناد مثله ولم يرفعه
[Its isnad is sahih, mawquf]. It is in Kubra, hadith no. 3561, and see the previous hadith.