Abu Dawud
Jihad
Book Number: 008 / Hadith Number: 2494
Narated By Fadalah ibn Ubayd : The Prophet (pbuh) 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.