Apostasy
2: 27 Those who break Allah's Covenant after it is ratified, and who sunder what Allah Has ordered to be joined, and do mischief on earth: These cause loss (only) to themselves.
2:39, “But those who reject Faith and belie Our Signs, they shall be companions of the Fire; they shall abide therein.”
3:90-91 "Verily, those who disbelieved after their Belief and then went on increasing in their disbelief - never will their repentance be accepted [because they repent only by their tongues and not from their hearts]. And they are those who are astray. Verily, those who disbelieved, and died while they were disbelievers, the (whole) earth full of gold will not be accepted from anyone of them even if they offered it as a ransom. For them is a painful torment and they will have no helpers."
4:89 They long that ye should disbelieve even as they disbelieve, that ye may be upon a level (with them). So choose not friends from them till they forsake their homes in the way of Allah; if they turn back (to enmity) then take them and kill them wherever ye find them, and choose no friend nor helper from among them,”
9:66, Make ye no excuses: ye have rejected Faith after ye had accepted it. If We pardon some of you, We will punish others amongst you, for that they are in sin
9:74, They swear by Allah that they said nothing (evil), but indeed they uttered blasphemy, and they did it after accepting Islam; and they meditated a plot which they were unable to carry out: this revenge of theirs was (their) only return for the bounty with which Allah and His Messenger had enriched them! If they repent, it will be best for them; but if they turn back (to their evil ways), Allah will punish them with a grievous penalty in this life and in the Hereafter: They shall have none on earth to protect or help them.
47:25,26 Those who turn back as apostates after Guidance was clearly shown to them, the Evil One has instigated them and busied them up with false hopes.
Volume 9, Book 83, Number 17:
Narrated 'Abdullah:
Allah's Apostle said, "The blood of a Muslim who confesses that none has the right to be worshipped but Allah and that I am His Apostle, cannot be shed except in three cases: In Qisas for murder, a married person who commits illegal sexual intercourse and the one who reverts from Islam (apostate) and leaves the Muslims."
Bukhari Volume 4, Book 54, Number 445:
Narrated Abu Dhar:
The Prophet said, "Gabriel said to me, 'Whoever amongst your followers die without having worshipped others besides Allah, will enter Paradise (or will not enter the (Hell) Fire)." The Prophet asked. "Even if he has committed illegal sexual intercourse or theft?" He replied, "Even then."
(Sahih Bukhari 4.260)
Narrated Ikrima:
Ali burnt some people [hypocrites] and this news reached Ibn 'Abbas, who said, "Had I been in his place I would not have burnt them, as the Prophet said, 'Don't punish (anybody) with Allah's Punishment.' No doubt, I would have killed them, for the Prophet said, 'If somebody (a Muslim) discards his religion, kill him.' "
Sahih Bukhari Volume 9, Book 84, Number 57:
Narrated 'Ikrima:
Some Zanadiqa (atheists) were brought to 'Ali and he burnt them. The news of this event, reached Ibn 'Abbas who said, "If I had been in his place, I would not have burnt them, as Allah's Apostle forbade it, saying, 'Do not punish anybody with Allah's punishment (fire).' I would have killed them according to the statement of Allah's Apostle, 'Whoever changed his Islamic religion, then kill him.'"
