﴿ ۞ وَيَسْتَنۢبِـُٔونَكَ أَحَقٌّ هُوَ ۖ قُلْ إِى وَرَبِّىٓ إِنَّهُۥ لَحَقٌّۭ ۖ وَمَآ أَنتُم بِمُعْجِزِينَ ﴾

“And some people ask thee, "Is all this true?" Say: "Yea, by my Sustainer! It is most certainly true, and you cannot elude [the final reckoning]!"”

(And they ask thee) O Muhammad (to inform them) i.e. about the punishment and the Qur'an ((saying): Is it true) i.e. the punishment and the Qur'an? (Say: Yea, by my Lord) say: yes, by my Lord, (verily it is true) the punishment will truly happen, (and ye cannot escape) Allah's punishment.