وَمَا كَانَ لَهُ عَلَيْهِم مِّن سُلْطَانٍ إِلَّا لِنَعْلَمَ مَن يُؤْمِنُ بِالْآخِرَةِ مِمَّنْ هُوَ مِنْهَا فِي شَكٍّ وَرَبُّكَ عَلَى كُلِّ شَيْءٍ حَفِيظٌ

He had no authority over them, but that We may ascertain those who believe in the Hereafter from those who are in doubt about it, and your Lord is watchful over all things.