There are dozens of “solid” hadithic quotes with Muhammad’s assurances that Allah guarantees to all jihadi warriors instant paradise in case of martyrdom, or “reward or booty he has earned.” To be a Muslim was rewarding in the hereafter, and profitable in this life: “Jihad is the best method of earning, both spiritual and temporal. If victory is won, there is enormous booty and conquest of a country, which cannot be equaled to any other source of earning. If there is defeat or death, there is everlasting Paradise and a great spiritual benefit. This sort of Jihad is conditional upon pure motive (i.e., for establishing the kingdom of Allah on earth).”
The Sword of the Prophet: Islam History, Theology, Impact on the World p.88