At-Tawbah 9:111

Inna Allaha ishtara minaalmu/mineena anfusahum waamwalahum bi-anna lahumualjannata yuqatiloona fee sabeeli Allahifayaqtuloona wayuqtaloona waAAdan AAalayhi haqqan fee attawratiwal-injeeli walqur-ani waman awfabiAAahdihi mina Allahi fastabshiroo bibayAAikumuallathee bayaAAtum bihi wathalika huwaalfawzu alAAatheem

Indeed, Allāh has purchased from the believers their lives and their properties [in exchange] for that they will have Paradise. They fight in the cause of Allāh, so they kill and are killed. [It is] a true promise [binding] upon Him in the Torah and the Gospel and the Qur’ān. And who is truer to his covenant than Allāh? So rejoice in your transaction which you have contracted. And it is that which is the great attainment.

Surely, Allah has bought their lives and their wealth from the believers, in exchange of (a promise) that Paradise shall be theirs. They fight in the way of Allah, and kill and are killed, on which there is a true promise (as made) in the Torah and the Injīl and the Qur’ān. And who can be more faithful to his covenant than Allah? So, rejoice in the deal you have made, and that is the great achievement.