Surah Ash-Shu'ara, ayah 145

وَمَآ أَسۡـَٔلُكُمۡ عَلَيۡهِ مِنۡ أَجۡرٍۖ إِنۡ أَجۡرِيَ إِلَّا عَلَىٰ رَبِّ ٱلۡعَٰلَمِينَ ١٤٥

Wamā as'alukum 'alayhi min ajrin in ajriya illā 'alā rabbil-'ālamīn

And I do not ask you for it any payment. My payment is only from the Lord of the worlds.