﴿ بِسْمِ ٱللَّهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ طسٓ ۚ تِلْكَ ءَايَٰتُ ٱلْقُرْءَانِ وَكِتَابٍۢ مُّبِينٍ ﴾

“Ta. Sin. THESE ARE MESSAGES of the Qur’an - a di­vine writ clear in itself and clearly showing the truth:”

Tā sīn God knows best what He means by these letters. Those namely these signs are the signs of the Qur’ān signs from it and a Manifest Book manifesting what is truth from what is falsehood wa-kitābin ‘Book’ is a supplement to al-qur’ān with the addition of an adjective mubīn ‘manifest’.