﴿ قُلْ مَا سَأَلْتُكُم مِّنْ أَجْرٍۢ فَهُوَ لَكُمْ ۖ إِنْ أَجْرِىَ إِلَّا عَلَى ٱللَّهِ ۖ وَهُوَ عَلَىٰ كُلِّ شَىْءٍۢ شَهِيدٌۭ ﴾

“Say: “No reward have I ever asked of you [out of anything] that is yours: my reward rests with none but God, and He is witness unto everything!””

Say to them ‘I have not asked you in return for my warning and delivering the Message to you any reward since it is for the benefit of you in other words I do not ask you for any reward in return for this. Indeed my reward lies only with God and He is Witness over all things’ observing them all knowing my truthfulness.