Lā ilāha illā anta subḥānaka innī kuntu minaẓ-ẓālimīn. 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.