Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī

ذِكْرُ اجْتِمَاعِ الْقَاتِلِ الْكَافِرِ الْمُسْلِمَ فِي الْجَنَّةِ إِذَا سَدَّدَ الْكَافِرُ فَأَسْلَمَ بَعْدُ

ibnhibban:4666 – al-Ḥusayn b. Muḥammad b. Abū Maʿshar Biḥirrān > Bundār And ʾAbū Mūsá > Muʾammal b. Ismāʿīl > Sufyān > Abū al-Zinād > al-Aʿraj > Abū Hurayrah

[Machine] The Prophet ﷺ said, "Allah laughs at two men; one of them killed his companion, and both of them will be in paradise."  

ابن حبّان:٤٦٦٦ – أَخْبَرَنَا الْحُسَيْنُ بْنُ مُحَمَّدِ بْنِ أَبِي مَعْشَرٍ بِحِرَّانَ حَدَّثَنَا بُنْدَارٌ وَأَبُو مُوسَى قَالَا حَدَّثَنَا مُؤَمَّلُ بْنُ إِسْمَاعِيلَ حَدَّثَنَا سُفْيَانُ عَنْ أَبِي الزِّنَادِ عَنِ الْأَعْرَجِ عَنْ أَبِي هُرَيْرَةَ

عَنِ النَّبِيِّ ﷺ قَالَ «ضَحِكَ اللَّهُ مِنْ رَجُلَيْنِ قَتَلَ أَحَدُهُمَا صَاحِبَهُ وَكِلَاهُمَا فِي الْجَنَّةِ»  

See similar narrations below:

Collected by Suyūṭī