once
اللَّهُ اللَّهُ رَبِّي لاَ أُشْرِكُ بِهِ شَيْئاً
Edition transliteration
None has the right to be worshipped except You. How perfect You are, verily I was among the wrong-doers.
Meaning
Allah, Allah is my Lord, I do not associate anything with Him.
Source and references
Hisn al-Muslim, entry 125.The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Fortress of the Muslim. Open source ↗