﴿ ۞ فَلْيُقَٰتِلْ فِى سَبِيلِ ٱللَّهِ ٱلَّذِينَ يَشْرُونَ ٱلْحَيَوٰةَ ٱلدُّنْيَا بِٱلْءَاخِرَةِ ۚ وَمَن يُقَٰتِلْ فِى سَبِيلِ ٱللَّهِ فَيُقْتَلْ أَوْ يَغْلِبْ فَسَوْفَ نُؤْتِيهِ أَجْرًا عَظِيمًۭا ﴾

“Hence, let them fight in God's cause - all who are willing to barter the life of this world for the life to come: for unto him who fights in God's cause, whether he be slain or be victorious, We shall in time grant a mighty reward.”

2. Seen outwardly, the words of the verse 72 (... وَإِنَّ مِنكُمْ ) seem to suggest that this too is addressed to the believers, although the characteristics described later on cannot be taken to be those of the believers. Therefore, al-Qurtubi says that they signify hypocrites. Since, they were the ones who used to claim being Muslims, at least outwardly. This is why they have been identified as a group from among the believers.