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سُبْحَانَكَ اللَّهُمَّ وَبِحَمْدِكَ, أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ أَنْتَ, أَسْتَغْفِرُكَ وَأَتُوبُ إِلَيْكَ
(How perfect You are O Allah, and I praise You. I bear witness that None has the right to be worshipped except You. I seek Your forgiveness and turn to You in repentance.)
Source: Abu Dawud, Ibn Majah, At-Tirmizi and An-Nasa'i, Ahmad 6/77