It was narrated from 'Amr bin Shu'aib, from his father, from his grandfather, that the Messenger of Allah (ﷺ) said:“A Muslim should not be killed in retaliation for the murder of a disbeliever.”
Hadith No. 2659
Sunan Ibn Majah
Gradings:
Al-Albani:
Hasan Sahih
Muhammad Fouad Abd al-Baqi:
Hasan Sahih
Shuaib Al Arnaut:
Sahih Lighairihi
Zubair Ali Zai:
Sahih