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"And whosoever submits his face (himself) to Allaah [i.e.(follows Allaah's Religion of Islaamic Monotheism), worships Allaah (Alone) with sincere Faith in the (1) Oneness of His Lordship,(2) Oneness of His worship, and (3) Oneness of His Names and Qualities], while he is a Muhsin (good-doer i.e, performs good deeds totally for Allaah's sake without any show-off or to gain praise or fame etc, and does them in accordance with the Sunnah of Allaah's Messenger Muhammad sal-Allaahu 'alayhe wa sallam), then he has grasped the most trustworthy hand-hold [La Ilaaha ill-Allaah (none has the right to be worshipped but Allaah)], And to Allaah return all matters for decision." [Luqmaan (31):22]

Narrated Abu Huraira:

The Prophet said, "The person who participates in (Holy battles) in Allah's cause and nothing compels him to do so except belief in Allah and His Apostles, will be recompensed by Allah either with a reward, or booty (if he survives) or will be admitted to Paradise (if he is killed in the battle as a martyr). Had I not found it difficult for my followers, then I would not remain behind any sariya going for Jihad and I would have loved to be martyred in Allah's cause and then made alive, and then martyred and then made alive, and then again martyred in His cause." [The Book of Faith Volume 1, Book 2, Hadeeth 35]