Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "Allah guarantees to the person who carries out Jihad for His Cause and nothing compelled him to go out but the Jihad in His Cause, and belief in His Words, that He will either admit him into Paradise or return him with his reward or the booty he has earned to his residence from where he went out." (See Hadith No. 555).
حَدَّثَنَا إِسْمَاعِيلُ، حَدَّثَنِي مَالِكٌ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " تَكَفَّلَ اللَّهُ لِمَنْ جَاهَدَ فِي سَبِيلِهِ، لاَ يُخْرِجُهُ إِلاَّ الْجِهَادُ فِي سَبِيلِهِ، وَتَصْدِيقُ كَلِمَاتِهِ، بِأَنْ يُدْخِلَهُ الْجَنَّةَ، أَوْ يَرْجِعَهُ إِلَى مَسْكَنِهِ الَّذِي خَرَجَ مِنْهُ، مَعَ مَا نَالَ مِنْ أَجْرٍ أَوْ غَنِيمَةٍ ".
Bukhari
Oneness, Uniqueness of Allah (Tawheed) • Hadith 83