The Most Profitable Investment (9:111)

The Most Profitable Investment

[9:111] GOD has bought from the believers their lives and their money in exchange for Paradise. Thus, they fight in the cause of GOD, willing to kill and get killed. Such is His truthful pledge in the Torah, the Gospel, and the Quran—and who fulfills His pledge better than GOD? You shall rejoice in making such an exchange. This is the greatest triumph. 

Alan Watts – Willing To Die
https://www.youtube.com/watch?v=ioFG999aOCs

This verse is severely abused by people with bad motives.

Outside of conditional training it really takes strong belief to be willing to kill and get killed in the cause of something.

[83:7] Indeed, the book of the wicked is in Sijjeen. [83:8] Do you know what Sijjeen is? [83:9] A numerically structured book.

[83:18] Indeed, the book of the righteous will be in ‘Elleyyeen. [83:19] Do you know what ‘Elleyyeen is? [83:20] A numerically structured book.

[3:154] After the setback, He sent down upon you peaceful slumber that pacified some of you. Others among you were selfishly concerned about themselves. They harbored thoughts about GOD that were not right – the same thoughts they had harbored during the days of ignorance. Thus, they said, “Is anything up to us?” Say, “Everything is up to GOD.” They concealed inside themselves what they did not reveal to you. They said, “If it was up to us, none of us would have been killed in this battle.” Say, “Had you stayed in your homes, those destined to be killed would have crawled into their death beds.” GOD thus puts you to the test to bring out your true convictions, and to test what is in your hearts. GOD is fully aware of the innermost thoughts.

The Best Deal

[61:10] O you who believe, let Me inform you of a trade that will save you from painful retribution. [61:11] Believe in GOD and His messenger and strive in the cause of GOD with your money and your lives. This is the best deal for you, if you only knew. [61:12] In return, He forgives your sins, and admits you into gardens with flowing streams, with beautiful mansions in the gardens of Eden. This is the greatest triumph. [61:13] Additionally, you get something you truly love: support from GOD and guaranteed victory. Give good news to the believers. 

The Quran repeatedly advocates the non-aggression principal.

Rules of War*

[2:190] You may fight in the cause of GOD against those who attack you, but do not aggress. GOD does not love the aggressors. [2:191] You may kill those who wage war against you, and you may evict them whence they evicted you. Oppression is worse than murder. Do not fight them at the Sacred Mosque (Masjid), unless they attack you therein. If they attack you, you may kill them. This is the just retribution for those disbelievers. [2:192] If they refrain, then GOD is Forgiver, Most Merciful. [2:193] You may also fight them to eliminate oppression, and to worship GOD freely. If they refrain, you shall not aggress; aggression is permitted only against the aggressors.