(37) باب اجْتِمَاعِ الْقَاتِلِ وَالْمَقْتُولِ فِي سَبِيلِ اللَّهِ فِي الْجَنَّةِ .
It was narrated from Abu Hurairah that the Prophet (ﷺ) said:
"Allah, the Mighty and Sublime, likes it when there are two men, one of whom killed the other, then they both enter Paradise." And another time he said: "He laughs at two men, one of whom killed the other, then they both entered Paradise."
Reference: Sunan an-Nasa'i 3165
In-book reference: Book 25, Hadith 81
English translation: Vol. 1, Book 25, Hadith 3167