Surah Sad, ayah 86

قُلۡ مَآ أَسۡـَٔلُكُمۡ عَلَيۡهِ مِنۡ أَجۡرٖ وَمَآ أَنَا۠ مِنَ ٱلۡمُتَكَلِّفِينَ ٨٦

Qul mā as'alukum 'alayhi min ajrin wamā ana minal-mutakallifīn

Say, [O Muḥammad], "I do not ask you for it [i.e., the Qur’ān] any payment, and I am not of the pretentious.