The Messenger of Allah said: "Whoever unsheathes his sword and starts to strike the people with it, it is permissible to shed his blood."
Sunan an-Nasa'i Book 37, Hadith 132
← Previous Hadith "I was sitting with Suwaid bin Muqarrin, and he said: The Messenger of Allah said: "Whoever is killed defending himself against injustice, he is a martyr."

Sunan an-Nasa'i Book 37, Hadith 131 Next Hadith → 'Abdur-Razzaq narrated a similar report with the same chain, but he did not attribute it to the Prophet

Sunan an-Nasa'i Book 37, Hadith 133