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"They wish that you reject Faith, as they have rejected (Faith), and thus that you all become equal (like one another), So take not Awliyaa' (protectors or friends) from them, till they emigrate in the Way of Allaah (to Muhammad sal-Allaahu 'alayhe wa sallam), But if they turn back (from Islaam), take (hold) of them and kill them wherever you find them, and take neither Awliyaa' (protectors or friends) nor helpers from them." [An-Nisaa' (4):89]

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]