Surah Yusuf, Verse 104

وَمَا تَسۡـَٔلُهُمۡ عَلَيۡهِ مِنۡ أَجۡرٍۚ إِنۡ هُوَ إِلَّا ذِكۡرٞ لِّلۡعَٰلَمِينَ١٠٤

wamā tasaluhum ʿalayhi min ajrin in huwa illā dhik'run lil'ʿālamīna

And you do not ask of them for it any payment. It is not except a reminder to the worlds.