(سُبْحانَكَ اللَّهُمَّ وَبِحَمْدِكَ، أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ أَنْتَ، أَسْتَغْفِرُكَ وَأَتوبُ 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 in repentance to You.
An-Nasa'i, 'Amalul-Yawm wal-Laylah, p. 173. See also Al-Albani, 'Irwa'ul-Ghalil 1/135 and 2/94.