وَيْلٌ يَوْمَئِذٍ لِّلْمُكَذِّبِينَ (Woe, that Day, to the deniers!...77:15) The word wail means 'destruction'. According to certain Hadith narratives, the word wail is a 'valley of Hell where the pus of the wounds of the inmates of Hell will be collected. This is the place where the deniers will live. After this, the present-day people are asked to learn a lesson from [ the destruction ] of the former generations, thus: