once
لاَ إِلَهَ إِلاَّ أَنْتَ سُبْحَانَكَ إِنِّي كُنْتُ مِنَ الظّالِمِينَ
Edition transliteration
La ilaha illa anta subhanaka innee kuntu minath-thalimeen.
Meaning
None has the right to be worshipped except You. How perfect You are, verily I was among the wrong-doers.
Source and references
Hisn al-Muslim, entry 124.The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Fortress of the Muslim. Open source ↗