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
suyuti:18227a –
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السيوطي:١٨٢٢٧a –

"لَيسَ عَدُوُّكَ الذي إِنْ قَتَلْتَه كَان لَكَ نُورًا، وَإنْ قَتلكَ دَخَلْتَ الْجَنَّة، ولَكِن أَعْدَى عَدُوٍّ لَكَ وَلَدُك الذي خَرَجَ مِن صُلْبِكَ ثُمَّ أَعْدى عَدُوٍّ لَكَ مَالُكَ الَّذي مَلَكَتْ يمِينُك".  

[طب] الطبرانى في الكبير عن أبي مالك الأشعرى

See similar narrations below:

Collected by Ṭabarānī
tabarani:3445 – Hāshim b. Marthad al-Ṭabarānī > Muḥammad b. Ismāʿīl b. ʿAyyāsh from my father > Ḍamḍam b. Zurʿah > Shurayḥ b. ʿUbayd > Abū Mālik al-Ashʿarī

[Machine] "That the Messenger of Allah ﷺ said, 'Your enemy is not the one whom if you kill, it would be for you light, and if he kills you, you would enter Paradise. But rather, your enemy is your own son who came out of your loins, then your enemy is your own wealth that is in your possession.'"  

الطبراني:٣٤٤٥ – حَدَّثَنَا هَاشِمُ بْنُ مَرْثَدٍ الطَّبَرَانِيُّ ثنا مُحَمَّدُ بْنُ إِسْمَاعِيلَ بْنِ عَيَّاشٍ حَدَّثَنِي أَبِي حَدَّثَنِي ضَمْضَمُ بْنُ زُرْعَةَ عَنْ شُرَيْحِ بْنِ عُبَيْدٍ عَنْ أَبِي مَالِكٍ الْأَشْعَرِيِّ

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «لَيْسَ عَدُوَّكَ الَّذِي إِنْ قَتَلْتَهُ كَانَ لَكَ نُورًا وَإِنْ قَتَلَكَ دَخَلْتَ الْجَنَّةَ وَلَكِنَّ أَعْدَى عَدُوِّكَ وَلَدُكَ الَّذِي خَرَجَ مِنْ صُلْبِكَ ثُمَّ أَعْدَى عَدُوٍّ لَكَ مَالُكَ الَّذِي مَلَكَتْ يَمِينُكَ»