إِنَّ اللَّـهَ اشْتَرى‏ مِنَ الْمُؤْمِنِينَ أَنْفُسَهُمْ وَ أَمْوالَهُمْ بِأَنَّ لَهُمُ الْجَنَّةَ يُقاتِلُونَ فِي سَبِيلِ اللَّـهِ فَيَقْتُلُونَ وَ يُقْتَلُونَ وَعْداً عَلَيْهِ حَقًّا فِي التَّوْراةِ وَ الْإِنْجِيلِ وَ الْقُرْآنِ وَ مَنْ أَوْفى‏ بِعَهْدِهِ مِنَ اللَّـهِ فَاسْتَبْشِرُوا بِبَيْعِكُمُ الَّذِي بايَعْتُمْ بِهِ وَ ذلِكَ هُوَ الْفَوْزُ الْعَظِيمُ

Verily Allah has bought from the believers their souls and their Properties for Paradise to be theirs: they fight in the way of Allah, so they slay and they are slain, (this is) a promise binding on Him in the Turah, and the Evangel and the Qur’ān. And who is more faithful to his promise than Allah? Rejoice then in your bargain that you have made; and that is the great success.

At‑Tawba (التوبة) ‎- 111