Prayers and Meditations — Paragraph 708
Source (Arabic)
إِنَّكَ أَنْتَ المُقْتَدِرُ عَلَى ما تَشآءُ لا إِلهَ إِلاَّ أَنْتَ الغَفُورُ الْكَرِيمُ.
Translation
Powerful art Thou to do what pleaseth Thee. There is none other God save Thee, the Ever-Forgiving, the Most Generous.