15:99 وَاعْبُدْ رَبَّكَ حَتَّى يَأْتِيَكَ الْيَقِينُ
And serve thy Lord until there come unto thee the Hour that is Certain.
74:45 وَكُنَّا نَخُوضُ مَعَ
الْخَائِضِينَ
"But we used to talk vanities with vain talkers;
74:46 وَكُنَّا نُكَذِّبُ بِيَوْمِ الدِّينِ
"And we used to deny the Day of Judgment,
74:47 حَتَّى أَتَانَا الْيَقِينُ
"Until there came to us (the Hour) that is certain."