Appears 30 times in the Quran. (Root: فتن)
  1. And they followed what the Shaitans chanted of sorcery in the reign of Sulaiman, and Sulaiman was not an unbeliever, but the Shaitans disbelieved, they taught men sorcery and that was sent down to the two angels at Babel, Harut and Marut, yet these two taught no man until they had said, "Surely we are only a trial, therefore do not be a disbeliever." Even then men learned from these two, magic by which they might cause a separation between a man and his wife; and they cannot hurt with it any one except with Allah's permission, and they learned what harmed them and did not profit them, and certainly they know that he who bought it should have no share of good in the hereafter and evil was the price for which they sold their souls, had they but known this.

  2. And kill them wherever you find them, and drive them out from whence they drove you out, and persecution is severer than slaughter, and do not fight with them at the Sacred Mosque until they fight with you in it, but if they do fight you, then slay them; such is the recompense of the unbelievers.

  3. And fight with them until there is no persecution, and religion should be only for Allah, but if they desist, then there should be no hostility except against the oppressors.

  4. They ask you concerning the sacred month about fighting in it. Say: Fighting in it is a grave matter, and hindering (men) from Allah's way and denying Him, and (hindering men from) the Sacred Mosque and turning its people out of it, are still graver with Allah, and persecution is graver than slaughter; and they will not cease fighting with you until they turn you back from your religion, if they can; and whoever of you turns back from his religion, then he dies while an unbeliever-- these it is whose works shall go for nothing in this world and the hereafter, and they are the inmates of the fire; therein they shall abide.

  5. He it is Who has revealed the Book to you; some of its verses are decisive, they are the basis of the Book, and others are allegorical; then as for those in whose hearts there is perversity they follow the part of it which is allegorical, seeking to mislead and seeking to give it (their own) interpretation. but none knows its interpretation except Allah, and those who are firmly rooted in knowledge say: We believe in it, it is all from our Lord; and none do mind except those having understanding.

  6. You will find others who desire that they should be safe from you and secure from their own people; as often as they are sent back to the mischief they get thrown into it headlong; therefore if they do not withdraw from you, and (do not) offer you peace and restrain their hands, then seize them and kill them wherever you find them; and against these We have given you a clear authority.

  7. And they thought that there would be no affliction, so they became blind and deaf; then Allah turned to them mercifully, but many of them became blind and deaf; and Allah is well seeing what they do.

  8. And fear an affliction which may not smite those of you in particular who are unjust; and know that Allah is severe in requiting (evil).

  9. And know that your property and your children are a temptation, and that Allah is He with Whom there is a mighty reward.

  10. And fight with them until there is no more persecution and religion should be only for Allah; but if they desist, then surely Allah sees what they do.

  11. And (as for) those who disbelieve, some of them are the guardians of others; if you will not do it, there will be in the land persecution and great mischief.

  12. Had they gone forth with you, they would not have added to you aught save corruption, and they would certainly have hurried about among you seeking (to sow) dissension among you, and among you there are those who hearken for their sake; and Allah knows the unjust.

  13. Certainly they sought (to sow) dissension before, and they meditated plots against you until the truth came, and Allah's commandment prevailed although they were averse (from it).

  14. And among them there is he who says: Allow me and do not try me. Surely into trial have they already tumbled down, and most surely hell encompasses the unbelievers.

  15. So they said: On Allah we rely: O our Lord! make us not subject to the persecution of the unjust people:

  16. And when We said to you: Surely your Lord encompasses men; and We did not make the vision which We showed you but a trial for men and the cursed tree in the Quran as well; and We cause them to fear, but it only adds to their great inordinacy.

  17. Every soul must taste of death and We try you by evil and good by way of probation; and to Us you shall be brought back.

  18. And I do not know if this may be a trial for you and a provision till a time.

  19. And among men is he who serves Allah (standing) on the verge, so that if good befalls him he is satisfied therewith, but if a trial afflict him he turns back headlong; he loses this world as well as the hereafter; that is a manifest loss.

  20. So that He may make what the Shaitan casts a trial for those in whose hearts is disease and those whose hearts are hard; and most surely the unjust are in a great opposition,

  21. Do not hold the Messenger's calling (you) among you to be like your calling one to the other; Allah indeed knows those who steal away from among you, concealing themselves; therefore let those beware who go against his order lest a trial afflict them or there befall them a painful chastisement.

  22. And We have not sent before you any messengers but they most surely ate food and went about in the markets; and We have made some of you a trial for others; will you bear patiently? And your Lord is ever Seeing.

  23. And among men is he who says: We believe in Allah; but when he is persecuted in (the way of) Allah he thinks the persecution of men to be as the chastisement of Allah; and if there come assistance from your Lord, they would most certainly say: Surely we were with you. What! is not Allah the best knower of what is in the breasts of mankind.

  24. And if an entry were made upon them from the outlying parts of it, then they were asked to wage war, they would certainly have done it, and they would not have stayed in it but a little while.

  25. Surely We have made it to be a trial to the unjust.

  26. So when harm afflicts a man he calls upon Us; then, when We give him a favor from Us, he says: I have been given it only by means of knowledge. Nay, it is a trial, but most of them do not know.

  27. Surely We are going to send the she-camel as a trial for them; therefore watch them and have patience.

  28. Our Lord! do not make us a trial for those who disbelieve, and forgive us, our Lord! surely Thou art the Mighty, the Wise.

  29. Your possessions and your children are only a trial, and Allah it is with Whom is a great reward.

  30. And We have not made the wardens of the fire others than angels, and We have not made their number but as a trial for those who disbelieve, that those who have been given the book may be certain and those who believe may increase in faith, and those who have been given the book and the believers may not doubt, and that those in whose hearts is a disease and the unbelievers may say: What does Allah mean by this parable? Thus does Allah make err whom He pleases, and He guides whom He pleases, and none knows the hosts of your Lord but He Himself; and this is naught but a reminder to the mortals.