It has been narrated on the authority of 'Abdullah b. 'Amr that the Messenger of Allah (ﷺ) said:
A troop of soldiers who fight in tile way of Allah and get their share of the booty receive in advance two-thirds of their reward in the Hereafter and only one-third will remain (to their credit). If they do not receive any booty, they will get their full reward.
Reference: Sahih Muslim 1906 a In-book : Book 33, Hadith 220 USC-MSA web (English) : Book 20, Hadith 4690 (deprecated)
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