Amr bin Hamiq reported,

I heard the Messenger of Allah ﷺ say, "Whoever grants a man safety for his life and then kills him will carry the banner of treachery on the Day of Resurrection."

Azami 6795

Sahih

عن عمرو بن الحمق الخزاعي قال

سمعت رسول الله ﷺ يقول: من أمن رجلا على دمه فقتله، فإنه يحمل لواء غدر يوم القيامة.

الأعظمي 6795صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Retaliation and crimes
Chapter
Prohibition of protected blood
Section
Discouragement from killing a believer
Numbering
Jami al-Kamil 6795 (2nd edition)
Azami 6795