﴿ بِسْمِ ٱللَّهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ الٓمٓر ۚ تِلْكَ ءَايَٰتُ ٱلْكِتَٰبِ ۗ وَٱلَّذِىٓ أُنزِلَ إِلَيْكَ مِن رَّبِّكَ ٱلْحَقُّ وَلَٰكِنَّ أَكْثَرَ ٱلنَّاسِ لَا يُؤْمِنُونَ ﴾

“Alif. Lam. Mim. Ra. THESE ARE MESSAGES of revelation: and what has been bestowed upon thee from on high by thy Sustainer is the truth-yet most people will not believe [in it]?”

And from his chain of transmitters on the authority of Ibn 'Abbas that he said in explanation of Allah's words (Alif. Lam. Mim. Ra.): '(Alif. Lam. Mim. Ra.) this means: I am Allah; I know what you do and say; it is also said that this is an oath by which Allah swore. (These are verses of the Scripture) this surah consists of verses of the Scripture. (That which is revealed unto thee from thy Lord is the Truth) He says: The Qur'an is the Truth from your Lord, (but most of mankind) the people of Mecca (believe not) in Muhammad (pbuh) or in the Qur'an.