Surah Al-Mu'minun Verse 72

أَمْ تَسْأَلُهُمْ خَرْجًا فَخَرَاجُ رَبِّكَ خَيْرٌ ۖ وَهُوَ خَيْرُ الرَّازِقِينَ

Or do you, [O Muhammad], ask them for payment? But the reward of your Lord is best, and He is the best of providers