"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.
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