Sunan an-Nasa'i 5030
It was narrated that Abu Hurairah said:
"The Messenger of Allah [SAW] said: 'Allah, the Mighty and Sublime, has guaranteed to the one who goes out in His cause, 'and he does not go out for any other purpose except Jihad in My cause and faith in Me, believing in My Messengers, but he is guaranteed that I will admit him to Paradise or I will send him back to his dwelling from which he set out, having acquired whatever he acquired of reward or spoils of war.'"
أَخْبَرَنَا مُحَمَّدُ بْنُ قُدَامَةَ قَالَ حَدَّثَنَا جَرِيرٌ عَنْ عُمَارَةَ بْنِ الْقَعْقَاعِ عَنْ أَبِي زُرْعَةَ عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ   قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ تَضَمَّنَ اللَّهُ عَزَّ وَجَلَّ لِمَنْ خَرَجَ فِي سَبِيلِهِ لَا يُخْرِجُهُ إِلَّا الْجِهَادُ فِي سَبِيلِي وَإِيمَانٌ بِي وَتَصْدِيقٌ بِرُسُلِي فَهُوَ ضَامِنٌ أَنْ أُدْخِلَهُ الْجَنَّةَ أَوْ أُرْجِعَهُ إِلَى مَسْكَنِهِ الَّذِي خَرَجَ مِنْهُ نَالَ مَا نَالَ مِنْ أَجْرٍ أَوْ غَنِيمَةٍ