Prayers and Meditations — Paragraph 536
Source (Arabic)
المُقْتَدِرُ عَلَى ما تَشآءْ لا إِلهَ إِلاَّ أَنْتَ المُهَيْمِنُ القَيُّومُ.
Translation
Potent art Thou to do what Thou willest. No God is there beside Thee, the Help in Peril, the Self-Subsisting.