It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:
"Allah laughs at two men, one of whom killed the other but they both entered Paradise. The first one fought in the cause of Allah and was killed, then Allah accepted the repentance of the one who killed him, and he fought and was martyred."
Reference: Sunan an-Nasa'i 3166 In-book : Book 25, Hadith 82 English translation : Vol. 1, Book 25, Hadith 3168
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