Quran 41:50 from Surah Fussilat on Divine Marvels.
وَلَئِنۡ أَذَقۡنَٰهُ رَحۡمَةٗ مِّنَّا مِنۢ بَعۡدِ ضَرَّآءَ مَسَّتۡهُ لَيَقُولَنَّ هَٰذَا لِي وَمَآ أَظُنُّ ٱلسَّاعَةَ قَآئِمَةٗ وَلَئِن رُّجِعۡتُ إِلَىٰ رَبِّيٓ إِنَّ لِي عِندَهُۥ لَلۡحُسۡنَىٰۚ فَلَنُنَبِّئَنَّ ٱلَّذِينَ كَفَرُواْ بِمَا عَمِلُواْ وَلَنُذِيقَنَّهُم مِّنۡ عَذَابٍ غَلِيظٖ
English translation: And verily, if We let him taste mercy from Us after after an adversity (has) touched him he will surely say This (is) (due) to me and not I think the Hour (will be) established and if I am returned to my Lord indeed for me with Him (will be) the best But We will surely inform those who disbelieved about what they did and We will surely make them taste of a punishment severe
Transliteration: wala-in adhaqnahu rahmatan minna min ba'di darraa massathu layaqulanna hadha li wama azunnu al-sa'ata qaimatan wala-in ruji'tu ila rabbi inna li indahu lalhus'na falanunabbi-anna alladhina kafaru bima amilu walanudhiqannahum min adhabin ghalizin