﴿ ۞ إِنَّ ٱللَّهَ ٱشْتَرَىٰ مِنَ ٱلْمُؤْمِنِينَ أَنفُسَهُمْ وَأَمْوَٰلَهُم بِأَنَّ لَهُمُ ٱلْجَنَّةَ ۚ يُقَٰتِلُونَ فِى سَبِيلِ ٱللَّهِ فَيَقْتُلُونَ وَيُقْتَلُونَ ۖ وَعْدًا عَلَيْهِ حَقًّۭا فِى ٱلتَّوْرَىٰةِ وَٱلْإِنجِيلِ وَٱلْقُرْءَانِ ۚ وَمَنْ أَوْفَىٰ بِعَهْدِهِۦ مِنَ ٱللَّهِ ۚ فَٱسْتَبْشِرُوا۟ بِبَيْعِكُمُ ٱلَّذِى بَايَعْتُم بِهِۦ ۚ وَذَٰلِكَ هُوَ ٱلْفَوْزُ ٱلْعَظِيمُ ﴾

“BEHOLD, God has bought of the believers their lives and their possessions, promising them paradise in return, [and so] they fight in God's cause, and slay, and are slain: a promise which in truth He has willed upon Himself in [the words of] the Torah, and the Gospel, and the Qur'an. And who could be more faithful to his covenant than God? Rejoice, then, in the bargain which you have made with Him: for this, this is the triumph supreme!”

Indeed God has purchased from the believers their lives and their possessions that they expend it in obedience of Him — for example by striving in His way — so that theirs will be the reward of Paradise they shall fight in the way of God and they shall kill and be killed this sentence is independent and constitutes an explication of the above-mentioned ‘purchase’; a variant reading has the passive verb come first sc. fa-yuqtalūna wa-yaqtulūn ‘they shall be killed and shall kill’ meaning that some of them are killed while those who remain fight on; that is a promise which is binding both wa‘dan ‘promise’ and haqqan ‘binding’ are verbal nouns and are in the accusative on account of their omitted implicit verbs upon Him in the Torah and the Gospel and the Qur’ān; and who fulfils his covenant better than God? that is no one is better in fulfilling it. Rejoice then there is a shift from the third to second person here in this bargain of yours which you have made for that bargain is the supreme triumph the one that secures the ultimate goal.