This [Qur'an] is notification for the people that they may be warned (14:52)

﴿هَٰذَا بَلَاغٌ لِّلنَّاسِ وَلِيُنذَرُوا بِهِ وَلِيَعْلَمُوا أَنَّمَا هُوَ إِلَٰهٌ وَاحِدٌ وَلِيَذَّكَّرَ أُولُو الْأَلْبَابِ﴾
[ إبراهيم: 52]

14:52 This [Qur'an] is notification for the people that they may be warned thereby and that they may know that He is but one God and that those of understanding will be reminded.

This Qur’ān, which was revealed to Muhammad ( peace be upon him ), is a forewarning from Allah to mankind so that they may take heed of the warnings and severe threats in it; and so they may know that the one who is obeyed in truth is Allah alone so that they will worship Him and not associate any partners with Him.
Also, so that those with sound intellects will be admonished and warned by it, as they are the ones who will benefit from admonitions and warnings.

This (Quran) is a Message for mankind (and a clear proof against them), in order that they may be warned thereby, and that they may know that He is the only One Ilah (God - Allah) - (none has the right to be worshipped but Allah), and that men of understanding may take heed.

phonetic Transliteration

Hatha balaghun lilnnasi waliyuntharoo bihi waliyaAAlamoo annama huwa ilahun wahidun waliyaththakkara oloo alalbabi

Abdullah Yusuf Ali - Translation

Here is a Message for mankind: Let them take warning therefrom, and let them know that He is (no other than) One Allah: let men of understanding take heed.

Safi-ur-Rahman al-Mubarakpuri

This (Qur'an) is a Message for mankind (and a clear proof against them), in order that they may be warned thereby, and that they may know that He is the only One God and that men of understanding may take heed.

Page 261 English transliteration