The word(s) "tribulation" appears 4 time(s) in 4 verse(s) in Quran in Muhammad Pickthal translation.

(1) It is not righteousness that ye turn your faces to the East and the West; but righteous is he who believeth in Allah and the Last Day and the angels and the Scripture and the prophets; and giveth wealth, for love of Him, to kinsfolk and to orphans and the needy and the wayfarer and to those who ask, and to set slaves free; and observeth proper worship and payeth the poor-due. And those who keep their treaty when they make one, and the patient in tribulation and adversity and time of stress. Such are they who are sincere. Such are the Allah-fearing.

(2) We have sent already unto peoples that were before thee, and We visited them with tribulation and adversity, in order that they might grow humble.

(3) And We sent no prophet unto any township but We did afflict its folk with tribulation and adversity that haply they might grow humble.

(4) Then changed We the evil plight for good till they grew affluent and said: tribulation and distress did touch our fathers. Then We seized them unawares, when they perceived not.