Surah Al-'Ankabut, ayah 21

يُعَذِّبُ مَن يَشَآءُ وَيَرۡحَمُ مَن يَشَآءُۖ وَإِلَيۡهِ تُقۡلَبُونَ ٢١

Yu'addhibu man yashā'u wayarhamu man yashā'u wa ilayhi tuqlabūn

He punishes whom He wills and has mercy upon whom He wills, and to Him you will be returned.