Indeed, Allah has purchased from the believers their lives and their properties [in exchange] for that they will have Paradise. They fight in the cause of Allah , so they kill and are killed. This is a true promise which is binding on Him mentioned in Taurat (Torah), the Injeel (Gospel) and the Qur’an; and who is more true in fulfilling his promise than Allah? Rejoice, therefore, in the bargain which you have made, and that is a mighty achievement.
Meaning:-
Rejoice: feel or show great joy or delight.