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"Behold! You are those who are called to spend in the Cause of Allaah, yet among you are some who are niggardly, And whoever is niggardly, it is only at the expense of his ownself, But Allaah is Rich (Free of all wants), and you (mankind) are poor, And if you turn away (from Islaam and the obedience of Allaah), He will exchange you for some other people, and they will not be your likes." [Muhammad (47):38]

Narrated 'Ubada bin As-Samit:

who took part in the battle of Badr and was a Naqib (a person heading a group of six persons), on the night of Al-'Aqaba pledge: Allah's Apostle said while a group of his companions were around him, "Swear allegiance to me for:

1. Not to join anything in worship along with Allah.
2. Not to steal.
3. Not to commit illegal sexual intercourse.
4. Not to kill your children.
5. Not to accuse an innocent person (to spread such an accusation among people).
6. Not to be disobedient (when ordered) to do good deed."

The Prophet added: "Whoever among you fulfills his pledge will be rewarded by Allah. And whoever indulges in any one of them (except the ascription of partners to Allah) and gets the punishment in this world, that punishment will be an expiation for that sin. And if one indulges in any of them, and Allah conceals his sin, it is up to Him to forgive or punish him (in the Hereafter)." 'Ubada bin As-Samit added: "So we swore allegiance for these." (points to Allah's Apostle) [The Book of Faith Volume 1, Book 2, Hadeeth 17]