﴿ وَإِنَّهُۥ لَحَقُّ ٱلْيَقِينِ ﴾

“for, verily, it is truth absolute!”

(And lo! It) i.e. the Qur'an (is Absolute Truth) it is truly and certainly My speech which Gabriel took down to an illustrious messenger; it is also said that this means: and that which I have mentioned of the disbelievers' anguish and remorse is true and certain; such anguish and remorse on the Day of Judgement will surely take place.