فَلْيُقَاتِلْSo fight,the believer with an aversion (to fighting),فِي سَبِيلِ اللّهِ الَّذِينَ يَشْرُونَ الْحَيَاةَ الدُّنْيَا بِالاخِرَةِthose who trade the life of this world with the Hereafter,referring to those sell their religion for the meager goods of the world, and they only do this because of their disbelief and lack of faith.Allah then said;وَمَن يُقَاتِلْ فِي سَبِيلِ اللّهِ فَيُقْتَلْ أَو يَغْلِبْ فَسَوْفَ نُوْتِيهِ أَجْرًا عَظِيمًاAnd whoever fights in the cause of Allah, and is killed or gets victory, We shall bestow on him a great reward.meaning, whoever fights in the cause of Allah, whether he was killed or triumphant, he will earn an immense compensation and a great reward with Allah.The Two Sahihs recorded,وَتَكَفَّلَ اللهُ لِلْمُجَاهِدِ فِي سَبِيلِهِ إِنْ تَوَفَّاهُ أَنْ يُدْخِلَهُ الْجَنَّةَ أَوْ يَرْجِعَهُ إِلى مَسْكَنِهِ الَّذِي خَرَجَ مِنْهُ بِمَا نَالَ مِنْ أَجْرٍ أَوْ غَنِيمَةAllah has guaranteed the Mujahid in His cause that; He will either bring death to him, admitting into Paradise; or, He will help him return safely to his home with whatever reward and booty he gained.