فَسَبِّحْ بِاسْمِ رَبِّكَ الْعَظِيمِ

Proclaim the purity of your great Lord from blemishes and faults. Be grateful for the things that He gave you, i.e. all of the great blessings, from which the greatest is the blessing of the Qur’ān.

Allāh سبحان وتعالى ended Sūrah Al-Ḥāqqah by glorifying the matter of the Qur’ān, exalting and praising the Most Merciful because it is the primary objective of this noble sūrah. The sūrah is in rebuke to all the impudent criminals who claimed the Qur’ān to be from the tails of the early people.