Sura al-Qaṣaṣ 28:86

وَمَا كُنتَ تَرْجُوٓا۟ أَن يُلْقَىٰٓ إِلَيْكَ ٱلْكِتَٰبُ إِلَّا رَحْمَةً مِّن رَّبِّكَ فَلَا تَكُونَنَّ ظَهِيرًا لِّلْكَٰفِرِينَ

wa-mā kunta tarjū an yulqā ilayka l-kitābu illā raḥmatan min rabbika fa-lā takūnanna ẓahīran lil-kāfirīna

And thou hadst not expected that the Book would be sent to thee except as a Mercy from thy Lord: Therefore lend not thou support in any way to those who reject (Allah's Message).