There is none worthy of worship but You, glory is to You. Surely, I was among the wrongdoers.

Reference:At-Tirmidhi 5/529. Al-Hakim declared it authentic and Ath-Thahabi agreed with him 1/ 505. See also Al-Albani, Sahih At-Tirmidhi 3/168.Hisnul Muslim 124

لَا إِلَهَ إِلَّا أنْـت سُـبْحانَكَ إِنِّي كُنْـتُ مِنَ الظّـالِميـن

Transliteration

Lā ilāha illā anta subḥānakainnī kuntu minaẓ-ẓālimīn.

Translation

There is none worthy of worship but You, glory is to You. Surely, I was among the wrongdoers.