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"It was not becoming of the people of Al- Madinah and the bedouins of the neighbourhood to remain behind Allaah's Messenger (Muhammad sal-Allaahu 'alayhe wa sallam when fighting in Allaah's Cause) and (it was not becoming of them) to prefer their own lives to his life, That is because they suffer neither thirst nor fatigue, nor hunger in the Cause of Allaah, nor they take any step to raise the anger of disbelievers nor inflict any injury upon an enemy but is written to their credit as a deed of righteousness, Surely, Allaah wastes not the reward of the Muhsinoon" [At-Taubah (9):120]

Narrated Ibn 'Umar:

Allah's Apostle said: Islam is based on (the following) five (principles):

1. To testify that none has the right to be worshipped but Allah and Muhammad is Allah's Apostle.
2. To offer the (compulsory congregational) prayers dutifully and perfectly.
3. To pay Zakat (i.e. obligatory charity).
4. To perform Hajj. (i.e. Pilgrimage to Mecca)
5. To observe fast during the month of Ramadan.

[The Book of Faith Volume 1, Book 2, Hadeeth 7]