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wa-ka-dhālika fatannā baʿḍahum bi-baʿḍin li-yaqūlū ʾa-hāʾulāʾi manna llāhu ʿalayhim min bayninā ʾa-laysa llāhu bi-ʾaʿlama bi-sh-shākirīna
Thus do We test them by means of one another so that they should say, ‘Are these the ones whom Allah has favoured from among us?!’ Does not Allah know best the grateful?!
— Ali Quli Qarai
Surah Al-‘An’am, Verse 53
53. "And thus did We try some of them by others so that they (mockingly) say: "Are these they upon whom Allah has favored from among us?' Does not Allah know best the grateful?"
In this verse, the Qur'an warns the rich disbelievers that these processes are as some trials upon them. When they fail in these tests, they should tolerate the painful results of their deeds. The verse says:
The Arabic term /fitnah/, here, means 'trial'. Then the verse continues stating the meaning that these rich people reach a state that they look at the true believers despisingly and, as the verse adds:
They ask whether these believers, upon whom Allah has bestowed Islam, are worthy that these words to be spoken about. Then, the Qur'an answers them implying that these believers are some people who have thanked for the blessing of knowledge and recognition when they applied it. They also have thanked the invitation of the Prophet (S) by accepting him. What blessing and thanksgiving is greater than that Allah has set the Faith firm in their hearts!
It is cited in Atyab-ul-Bayan that once; someone came to Imam Kazim (as) and complained about his poverty. Imam (as) asked him whom he thought as the richest person. The man answered that Harun-ur-Rashid was. Imam (as) asked him whether he agreed to exchange his own Faith for his (Harun's) wealth. The man said: 'No'. Imam (as) said:
'Then, you are richer than him, since you have something that you are not ready to change for his wealth."