Satan's limited authority

إِنَّ عِبَادِى لَيْسَ لَكَ عَلَيْهِمْ سُلْطَـٰنٌ إِلَّا مَنِ ٱتَّبَعَكَ مِنَ ٱلْغَاوِينَ

Indeed, My servants - no authority will you have over them, except those who follow you of the deviators.

وَمَا كَانَ لَهُۥ عَلَيْهِم مِّن سُلْطَـٰنٍ إِلَّا لِنَعْلَمَ مَن يُؤْمِنُ بِٱلْـَٔاخِرَةِ مِمَّنْ هُوَ مِنْهَا فِى شَكٍّ ۗ وَرَبُّكَ عَلَىٰ كُلِّ شَىْءٍ حَفِيظٌ

And he had over them no authority except [it was decreed] that We might make evident who believes in the Hereafter from who is thereof in doubt. And your Lord, over all things, is Guardian.