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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:28139a –
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السيوطي:٢٨١٣٩a –

"يَقُولُ اللَّه: الْمُجَاهِدُ فِى سَبيلِى هُوَ عَلىَّ ضَامِنٌ إِن قَبَضْتُهُ أَوْرَثْتُهُ الجَنَّةَ، وَإِنْ رَجَعْتُهُ رَجَعْتُهُ بِأَجْرٍ أَوْ غَنِيمَةٍ".  

[ت] الترمذي حسن صحيح غريب [ص] سعيد بن منصور عن أنس

See similar narrations below:

Collected by Tirmidhī
tirmidhi:1620 – Muḥammad b. ʿAbdullāh b. Bazīʿ > al-Muʿtamir b. Sulaymān > Marzūq Abū Bakr > Qatādah > Anas b. Mālik

"The Messenger of Allah ﷺ said: meaning: Allah Mighty and Sublime is He says: 'The Mujahid in My cause, he has guarantee fro Me. If I I seize him, I cause him to inherit Paradise, and if I return him, I return him with a reward or spoils of war.'" [He said:] This Hadith is Gharib Sahih from this route.  

الترمذي:١٦٢٠ – حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ بَزِيعٍ حَدَّثَنَا الْمُعْتَمِرُ بْنُ سُلَيْمَانَ حَدَّثَنِي مَرْزُوقٌ أَبُو بَكْرٍ عَنْ قَتَادَةَ عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ يَعْنِي يَقُولُ اللَّهُ ﷻ الْمُجَاهِدُ فِي سَبِيلِ اللَّهِ هُوَ عَلَىَّ ضَامِنٌ إِنْ قَبَضْتُهُ أَوْرَثْتُهُ الْجَنَّةَ وَإِنْ رَجَعْتُهُ رَجَعْتُهُ بِأَجْرٍ أَوْ غَنِيمَةٍ قَالَ هُوَ صَحِيحٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ