Indeed, Lord Allah has purchased from the believers their soul and their wealth for that they will have Paradise; they fight in the cause of Allah, so they kill and are killed; a True Promise upon Him in the Torah, the Gospel, and the Qur'an; and who is fulfilling his covenant than Allah? Then rejoice in your trade which you have made with Him, and that is a great triumph.
It is not the Arabic Qur’an, but Adhikr is the Book for repeated reading as explained in verses 5: 48 and 16: 44. All the 313 Messengers have been given Adhikr—the Truth and the Proof—as told in verse 21: 24. The aim of life is to achieve Paradise. So, if there is a group of believers, it is their duty to fight in the cause of Lord Allah by testifying verses 2: 193 and 8: 39-40. It is told in verse 3: 144 that Muhammad is none except a Messenger, surely, many Messengers have passed before him; then if he dies or is killed, will you turn back on your heels? Anyone who turns back on his heels will never injure Lord Allah in any way, and Allah will reward for the grateful.
Today there is no Jihad with weapons as there is no group of believers anywhere in the world. As explained in verse 2: 256 no one can make anyone a believer as there is no compulsion in the True way of life—Islam. The odd-believer will help Lord by propagating Adhikr—Food, Cloth, and Sight of the human soul—to form a harmony of mankind, and will do Jihad with It against the hypocrites and Kuffar as explained in verse 9: 73. See explanations 2: 62; 3: 136, 195 and 5: 119-120.