Hadithcore
Riyad as-Salihin, 24

Abu Hurairah (May Allah be pleased with him) reported:

Messenger of Allah (ﷺ) said, "Allah, the Exalted, smiles at two men, one of them killed the other and both will enter Jannah. The first is killed by the other while he is fighting in the Cause of Allah, and thereafter Allah will turn in mercy to the second and guide him to accept Islam and then he dies as a Shaheed (martyr) fighting in the Cause of Allah." <b>[Al-Bukhari and Muslim]</b>

وعن أبي هريرة رضي الله عنه أن رسول الله صلى الله عليه وسلم قال‏:‏ ‏

‏يضحك الله سبحانه وتعالى إلى رجلين يقتل أحدهما الآخر يدخلان الجنة، يقاتل هذا في سبيل الله فيقتل، ثم يتوب الله على القاتل فيسلم فيستشهد‏

‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏ ‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 24
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) The residents of Paradise are cleansed from spite and grudge to the extent that the killer and the one he killed both enter Paradise without harboring any grudge or hard feelings for each other, and it is in this respect that Allah Almighty laughs at them (in a way that befits His Majesty).<br> 2) Just as "embracing Islam wipes out the sins that preceded it", so does "repentance abolishes the sin committed preceding it." Hence, the believer should always be keen on renewing his repentance.
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