Abu Bakrah said:

“The Rasulullah sallillahu alaihi wa sallam said:

‘Whoever kills a Mu’ahad with no justification, Allah will forbid Paradise to him.”

Mu’ahad means  A non-Muslim who has a treaty with the Muslims, or is living under Muslim protection


Grade Sahih (Darussalam)
Reference  : Sunan an-Nasa’i 4747
In-book reference  : Book 45, Hadith 42
English translation  : Vol. 5, Book 45, Hadith 4751

The Book of Oaths (qasamah), Retaliation and Blood Money

Chapter: Seriousness Of Killing The One With A Covenant (Al-Mu’ahad)1