Sunan Abi Dawud, Hadith 2494 ⓘ
Narrated Fadalah ibn Ubayd: The Prophet said: Everyone who dies will have fully complete his action, except one who is on the frontier (in Allah's path), for his deeds will be made to go on increasing till the Day of Resurrection, and he will be safe from the trial in the grave.
حَدَّثَنَا سَعِيدُ بْنُ مَنْصُورٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، حَدَّثَنِي أَبُو هَانِئٍ، عَنْ عَمْرِو بْنِ مَالِكٍ، عَنْ فَضَالَةَ بْنِ عُبَيْدٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ : " كُلُّ الْمَيِّتِ يُخْتَمُ عَلَى عَمَلِهِ، إِلاَّ الْمُرَابِطَ فَإِنَّهُ يَنْمُو لَهُ عَمَلُهُ إِلَى يَوْمِ الْقِيَامَةِ وَيُؤَمَّنُ مِنْ فَتَّانِ الْقَبْرِ " .
also referenced under: Hadith 2500 (DarusSalam) & Book 14, Hadith 2494 (USC-MSA)