Motivated by religious fervor.

[FrodosPet]

57. Some verses which seem to justify violence against unbelievers

I am far from a scholar, and the meanings and historical context of the following verses are up for debate. But it should not be too hard to see how some people who are already inclined towards violence could justify violence from them.

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Surat Al-Baqarah
http://quran.com/2

2 : 190-194
Fight in the way of Allah those who fight you but do not transgress. Indeed. Allah does not like transgressors.

And kill them wherever you overtake them and expel them from wherever they have expelled you, and fitnah is worse than killing. And do not fight them at al-Masjid al- Haram until they fight you there. But if they fight you, then kill them. Such is the recompense of the disbelievers.

And if they cease, then indeed, Allah is Forgiving and Merciful.

Fight them until there is no [more] fitnah and [until] worship is [acknowledged to be] for Allah . But if they cease, then there is to be no aggression except against the oppressors.

[Fighting in] the sacred month is for [aggression committed in] the sacred month, and for [all] violations is legal retribution. So whoever has assaulted you, then assault him in the same way that he has assaulted you. And fear Allah and know that Allah is with those who fear Him.

2 : 216-218
Fighting has been enjoined upon you while it is hateful to you. But perhaps you hate a thing and it is good for you; and perhaps you love a thing and it is bad for you. And Allah Knows, while you know not.

They ask you about the sacred month - about fighting therein. Say, "Fighting therein is great [sin], but averting [people] from the way of Allah and disbelief in Him and [preventing access to] al-Masjid al-Haram and the expulsion of its people therefrom are greater [evil] in the sight of Allah . And fitnah is greater than killing." And they will continue to fight you until they turn you back from your religion if they are able. And whoever of you reverts from his religion [to disbelief] and dies while he is a disbeliever - for those, their deeds have become worthless in this world and the Hereafter, and those are the companions of the Fire, they will abide therein eternally.

Indeed, those who have believed and those who have emigrated and fought in the cause of Allah - those expect the mercy of Allah . And Allah is Forgiving and Merciful.

Surat 'Āli `Imrān
http://quran.com/3

3 : 56
And as for those who disbelieved, I will punish them with a severe punishment in this world and the Hereafter, and they will have no helpers."

3 : 151-152
We will cast terror into the hearts of those who disbelieve for what they have associated with Allah of which He had not sent down [any] authority. And their refuge will be the Fire, and wretched is the residence of the wrongdoers.

And Allah had certainly fulfilled His promise to you when you were killing the enemy by His permission until [the time] when you lost courage and fell to disputing about the order [given by the Prophet] and disobeyed after He had shown you that which you love. Among you are some who desire this world, and among you are some who desire the Hereafter. Then he turned you back from them [defeated] that He might test you. And He has already forgiven you, and Allah is the possessor of bounty for the believers.

3 : 157
And if you are killed in the cause of Allah or die - then forgiveness from Allah and mercy are better than whatever they accumulate [in this world].

3 : 181-185
Allah has certainly heard the statement of those [Jews] who said, "Indeed, Allah is poor, while we are rich." We will record what they said and their killing of the prophets without right and will say, "Taste the punishment of the Burning Fire.

That is for what your hands have put forth and because Allah is not ever unjust to [His] servants."

[They are] those who said, "Indeed, Allah has taken our promise not to believe any messenger until he brings us an offering which fire [from heaven] will consume." Say, "There have already come to you messengers before me with clear proofs and [even] that of which you speak. So why did you kill them, if you should be truthful?"

Then if they deny you, [O Muhammad] - so were messengers denied before you, who brought clear proofs and written ordinances and the enlightening Scripture.

Every soul will taste death, and you will only be given your [full] compensation on the Day of Resurrection. So he who is drawn away from the Fire and admitted to Paradise has attained [his desire]. And what is the life of this world except the enjoyment of delusion.

Surat An-Nisā'
http://quran.com/4

4 : 89
They wish you would disbelieve as they disbelieved so you would be alike. So do not take from among them allies until they emigrate for the cause of Allah . But if they turn away, then seize them and kill them wherever you find them and take not from among them any ally or helper.

4 : 91
You will find others who wish to obtain security from you and [to] obtain security from their people. Every time they are returned to [the influence of] disbelief, they fall back into it. So if they do not withdraw from you or offer you peace or restrain their hands, then seize them and kill them wherever you overtake them. And those - We have made for you against them a clear authorization.