وَمَا تَسْأَلُهُمْ عَلَيْهِ مِنْ أَجْرٍ إِنْ هُوَ إِلَّا ذِكْرٌ لِّلْعَالَمِينَ

You do not ask them any reward for it: it is just a reminder for all the nations.