Praise be to Allaah who urged for fighting in His cause and has promised a successful outcome and decisive victory in return for this. I testify that there is no deity except Allaah Alone who has no partner, and who says in His Glorious Book: …and (as for) the believers, it was incumbent upon Us to help (them). I testify that Muhammad is His servant, Messenger and His Khaleel (beloved Servant) who was the best of Mujaahids, the most sincere supporter, and the most truthful to His servants. Peace be upon him, his good, and purified family and his honorable Companions who dedicated themselves to Allaah (Exalted be He) and fought for His Cause until He made His religion prevail by their efforts. He made the believers superior and the disbelievers inferior by them (may Allaah be pleased with them, honor their final end, and made us of their followers in righteousness until the Day of Recompense.)
Jihaad in the cause of Allaah is one of the best deeds and acts of obedience that draw a person close to Allaah (Exalted be He). Indeed, it is the best deed offered by pious people after doing the prescribed acts, because it results in granting victory for the believers, elevating religion, suppressing the disbelievers, and hypocrites, spreading the Islaamic call among the people, bringing people from the darkness to the light and facilitating the spread of Islaamic virtues and its just rulings among people as well as many benefits and good returns for Muslims. There are many Hadeeths and Aayaahs (Qur’anic verses) related to the virtue of Jihad and the Mujaahids which encourages and stimulates truthful Muslims to contribute in Jihaad and to have sincere intentions in fighting the enemy of the Lord of the worlds. It is a collective obligation upon Muslims; if some people fulfill the tasks, other will be relieved the duty. It sometimes becomes an individual obligation that no Muslim can ignore except by a legal excuse like when the ruler calls for war or the enemy besieges an Islaamic country… read more here.