Dr. Mustafa Khattab, the Clear Quran - Surah Ash-Shams, ayah 9

Translation of Surah Ash-Shams, ayah 9 (91:9)

قَدۡ أَفۡلَحَ مَن زَكَّىٰهَا ٩
Successful indeed is the one who purifies their soul,