Quran 6:31 from Surah Al-An'aam on Divine Marvels.
قَدۡ خَسِرَ ٱلَّذِينَ كَذَّبُواْ بِلِقَآءِ ٱللَّهِۖ حَتَّىٰٓ إِذَا جَآءَتۡهُمُ ٱلسَّاعَةُ بَغۡتَةٗ قَالُواْ يَٰحَسۡرَتَنَا عَلَىٰ مَا فَرَّطۡنَا فِيهَا وَهُمۡ يَحۡمِلُونَ أَوۡزَارَهُمۡ عَلَىٰ ظُهُورِهِمۡۚ أَلَا سَآءَ مَا يَزِرُونَ
English translation: Indeed incurred loss those who denied in (the) meeting (with) Allah until when came to them the Hour suddenly they said Oh! Our regret over what we neglected concerning it while they will bear their burdens on their backs Unquestionably! Evil (is) what they bear
Transliteration: qad khasira alladhina kadhabu biliqai al-lahi hatta idha jaathumu al-sa'atu baghtatan qalu yahasratana ala ma farratna fiha wahum yahmiluna awzarahum ala zuhurihim ala saa ma yaziruna