once
سُبْحانَكَ اللَّهُمَّ وَبِحَمْدِكَ، أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ أَنْتَ، أَسْتَغْفِرُكَ وَأَتوبُ إِلَيْكَ
Edition transliteration
Subhanakal-lahumma wabihamdika ashhadu an la ilaha illa anta astaghfiruka wa-atoobu ilayk.
Meaning
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.
Source and references
Hisn al-Muslim, entry 15.The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Fortress of the Muslim. Open source ↗