Surah Sad (38:86)

قُلْ مَآ أَسْـَٔلُكُمْ عَلَيْهِ مِنْ أَجْرٍ وَمَآ أَنَا۠ مِنَ ٱلْمُتَكَلِّفِينَ

Say, “I do not ask you for it any reward, and I am not among those who affect [things] with strain.”