Thus, when you meet those who disbelieved, you strike their necks until you subdue them; then you seize them as captives, then you may let them free without ransom or with ransom, it is needed until the war lays down its burden; that is because if Allah had wished, surely He could have helped you from them, but it is to test some of you by means of others; those who are killed in the way of Allah, He will never let their deeds lost.
This verse contains the instruction connecting with the battle ‘Badar’. When the encounter is going on with the enemies of Allah-the disbelievers, the believers are commanded to smite on the necks of the disbelievers aiming to suppress them completely, and the captives should be kept under the custody and they shouldn’t be freed with or without ransom until the battle is completed. Thus when the battle is completed, the captives may be let free with or without getting ransom. If Allah wishes, He can give victory to the believers even without happening the battle. But the deputation of mankind to this world as Lord’s vicegerent, and everything including the battle are happened in order to make undergo some of the mankind with some others. See explanation 6: 164-165; 8: 60-61, 67-70; and 29: 30.
But since today, there is no any group of believers anywhere in the world or a leader of believers, the odd believer is commanded to do strenuous Jihad with Adhikr towards the hypocrites who are hiding and repudiating the verses, and kuffar who are rejecting the verses as told in the verses 9: 73; 25: 52; and 66: 9. When Antichrist-Masseh Addajjal-come to erase Islam completely, the Arabic Qur’an Reading Fujjar will accept him as prophet at first for getting water and food, and later even as Lord for getting the clowned copies of males and females for fulfilling their sexual thirst. Then Allah will bring Jesus for the second time, and thereby Antichrist and Fujjar will be killed implementing the command of the verses 4: 91; 5: 33; 9: 5, 123; and 33: 60-61. See explanation 40: 69-77.