سورة النمل · 27:1

1. Ta Sin. These are the verses of the Qur’ān and a clear book. The discussion on similar letters has passed in the beginning of Sūrah Al-Baqarah. These verses which are revealed to you are verses of the Qur’ān and a clear book in which there is no confusion. Whoever ponders upon it will know that it is from Allah.