﴿ يُوفُونَ بِٱلنَّذْرِ وَيَخَافُونَ يَوْمًۭا كَانَ شَرُّهُۥ مُسْتَطِيرًۭا ﴾

“[The truly virtuous are] they [who] fulfil their vows, and stand in awe of a Day the woe of which is bound to spread far and wide,”

Please check ayah 76:12 for complete tafsir.