Jihad means, exerting one’s utmost power contending with an object of disapprobation, and this is of three kinds, namely, (1) with a visible enemy, (2) with Satan, and (3) with one’s self.
The Quran teaches that when war breaks out, it should be waged in such a way as to cause the least possible amount of damage to life and property; and that hostilities should be brought to a close as quickly as possible.
22:40 Permission to fight is given to those against whom war is made, because they have been wronged and Allah indeed has power to help them.
22:41 Those who have been driven out from their homes unjustly only because they said, ‘Our lord is Allah’. And if Allah did not repel some men by means of others, there would surely have been pulled down cloisters and churches and synagogues and mosques, wherein the name of Allah is oft commemorated. And Allah will surely help one who helps Him. Allah is indeed Powerful, Mighty.
60:9 Allah forbids you not, respecting those who have not fought against you on account of your religion, and who have not driven you forth from your homes, that you be kind to them and act equitably towards them; surely Allah loves those who are equitable.
60:10 Allah only forbids you, respecting those who have fought against you on account of your religion, and have driven you out of your homes, and have helped others in driving you out, that you make friends of them, and whosoever makes friends of them–it is these that are the transgressors.
61:11 O ye who believe! shall I point out to you a bargain that will save you from a painful punishment?
61:12 That you believe in Allah and His Messenger, and strive in the cause of Allah with your wealth and your persons. That is better for you, if you did not know.
29:70 And as for those who strive in Our path–We will surely guide them in Our ways. And verily Allah is with those who do good.
9:20 Those who believe and emigrate from their homes for the sake of God and strive in the cause of Allah with their property and their persons have the highest rank in the sight of Allah. And it is they who shall triumph.
9:111 Surely, Allah has purchased of the believers their persons and their property in return for the Garden they shall have; they fight in the cause of Allah, and they slay and are slain–a promise that He has made incumbent on Himself in the Torah, and the Gospel, and the Quran. And who is more faithful to his promise than Allah? Rejoice, then, in your bargain which you have made with Him; and that it is which is the supreme triumph.
4:96 Those of the believers who sit still, excepting the disabled ones, and those who strive in the cause of Allah with their wealth and their persons, are not equal. Allah has exalted in rank those who strive with their wealth and their persons above those who sit still. And to each Allah has promised good. And Allah has exalted those who strive above those who sit still, by a great reward.