The word(s) "trial" appears 37 time(s) in 36 verse(s) in Quran in Mohsin Khan translation.

(21) Everyone is going to taste death, and We shall make a trial of you with evil and with good. And to Us you will be returned.

(22) And I know not, perhaps it may be a trial for you, and an enjoyment for a while.

(23) And among mankind is he who worships Allah as it were, upon the edge (i.e. in doubt): if good befalls him, he is content therewith; but if a trial befalls him, he turns back on his face (i.e. reverts to disbelief after embracing Islam). He loses both this world and the Hereafter. That is the evident loss.

(24) That He (Allah) may make what is thrown in by Shaitan (Satan) a trial for those in whose hearts is a disease (of hypocrisy and disbelief) and whose hearts are hardened. And certainly, the Zalimun (polytheists and wrong-doers) are in an opposition far-off (from the truth against Allah's Messenger and the believers).

(25) We hasten unto them with good things. Nay, [it is a Fitnah (trial) in this worldly life so that they will have no share of good things in the Hereafter] but they perceive not. [Tafsir Al-Qurtubi].

(26) Make not the calling of the Messenger (Muhammad صلى الله عليه وسلم) among you as your calling one of another. Allah knows those of you who slip away under shelter (of some excuse without taking the permission to leave, from the Messenger (صلى الله عليه وسلم). And let those who oppose the Messenger's (Muhammad صلى الله عليه وسلم) commandment (i.e. his Sunnah - legal ways, orders, acts of worship, statements) (among the sects) beware, lest some Fitnah (disbelief, trials, afflictions, earthquakes, killing, overpowered by a tyrant) should befall them or a painful torment be inflicted on them.

(27) And We never sent before you (O Muhammad صلى الله عليه وسلم) any of the Messengers but verily, they ate food and walked in the markets. And We have made some of you as a trial for others: will you have patience? And your Lord is Ever All-Seer (of everything).

(28) Of mankind are some who say: "We believe in Allah." But if they are made to suffer for the sake of Allah, they consider the trial of mankind as Allah's punishment; and if victory comes from your Lord, (the hypocrites) will say: "Verily we were with you (helping you)." Is not Allah Best Aware of what is in the breasts of the 'Alamin (mankind and jinn).

(29) Verily, that indeed was a manifest trial.

(30) When harm touches man, he calls to Us (for help); then when We have (rescued him from that harm and) changed it into a favour from Us, he says: "Only because of knowledge (that I possess) I obtained it." Nay, it is only a trial, but most of them know not!