‘Abd Allah bin Amr reported the Apostle of Allaah(ﷺ) as saying “No warlike party will go out to fight in Allaah’s path and gain booty without getting beforehand two-thirds of their rewards in the next world and one-third (of their reward) will remain. And if they do not gain booty, they will get their rewards in full

English translation · Sunan Abu Dawud