كتاب الجهاد
Read the English translation first, with the original Arabic directly underneath.
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."
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