69:51
وَإِنَّهُۥ لَحَقُّ ٱلْيَقِينِ ٥١
Saheeh International
And indeed, it is the truth of certainty.
Tafsir of "Ibn Kathir" (English)
And verily, it (this Qur'an) is an absolute truth with certainty.meaning, the right and truthful news in which there is no doubt, suspicion or confusion.Then Allah says,فَسَبِّحْ بِاسْمِ رَبِّكَ الْعَظِيمِ