Sunan Abi Dawud Book 15, Hadith 22
The Messenger of Allah (ﷺ) said: (The reward of) prayer, fasting and remembrance of Allah is enhanced seven hundred times over (the reward of) spending in Allah's path.
‘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.
AbuMalik heard the Messenger of Allah (ﷺ) say: He who goes forth in Allah's path and dies or is killed is a martyr, or has his neck broken through being thrown by his horse or by his camel, or is stung by a poisonous creature, or dies on his bed by any kind of death Allah wishes is a martyr and will go to Paradise.