It was narrated from Ibn 'Umar, from the Prophet ﷺ, of what he related from his Lord, the Mighty and Sublime:

"And of My slaves who goes out as a Mujahid striving in the cause of Allah, seeking my pleasure, I guarantee that I will bring him back with whatever he had earned as reward or spoils of war, and if I take his (soul) I will forgive him and have mercy on him."

أَخْبَرَنِي إِبْرَاهِيمُ بْنُ يَعْقُوبَ، قَالَ حَدَّثَنَا حَجَّاجٌ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ يُونُسَ، عَنِ الْحَسَنِ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ ﷺ فِيمَا يَحْكِيهِ عَنْ رَبِّهِ عَزَّ وَجَلَّ قَالَ " أَيُّمَا عَبْدٍ مِنْ عِبَادِي خَرَجَ مُجَاهِدًا فِي سَبِيلِ اللَّهِ ابْتِغَاءَ مَرْضَاتِي ضَمِنْتُ لَهُ أَنْ أَرْجَعَهُ إِنْ أَرْجَعْتُهُ بِمَا أَصَابَ مِنْ أَجْرٍ أَوْ غَنِيمَةٍ وَإِنْ قَبَضْتُهُ غَفَرْتُ لَهُ وَرَحِمْتُهُ " .