سُبْحـانَكَ اللّهُـمَّ وَبِحَمدِك أَشْهَـدُ أَنْ لا إِلهَ إِلاّ أَنْتَ أَسْتَغْفِرُكَ وَأَتوبُ إِلَـيْك
Subḥānaka Allāhumma wa biḥamdika, 'ash-hadu 'an lā 'ilāha 'illā 'Anta, 'astaghfiruka wa 'atūbu 'ilayk.
Glory is to You, O Allah, and praise; I bear witness that there is none worthy of worship but You. I seek Your forgiveness and turn to You in repentance.
An-Nasa'i, 'Amalul-Yawm wal-Laylah, p. 173. See also Al-Albani, 'Irwa'ul-Ghalil 1/135 and 2/94.