Prayers and Meditations — Paragraph 18
Source (Arabic)
أَنْتَ الَّذِيْ بِمَنِّكَ هَدَيْتَهُمْ وَسَمَّيْتَ نَفْسَكَ بِالرَّحْمنِ، لا إِلهَ إِلاَّ أَنْتَ العَزِيزُ الْمُسْتَعَانُ.
Translation
Thou art, verily, He Whose grace hath guided them aright, He Who hath declared Himself to be the All-Merciful. No God is there but Thee, the All-Glorious, the Supreme Helper.