SABA' (KAUM SABA') — Ayat 21

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