((لاَ إِلَهَ إِلاَّ أَنْتَ سُبْحَانَكَ إِنِّي كُنْتُ مِنَ الظّالِمِينَ)).
(None has the right to be worshipped except You. How perfect You are, verily I was among the wrong-doers.)
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.