Subhanaka Allahumma wabihamdik, ashhadu an la ilaha illa anta, astaghfiruka wa atubu ilayka
Glory be to You, O Allah, and praise be to You. I bear witness that there is no deity except You. I seek Your forgiveness and turn to You in repentance.
Source as cited by the compiler an-Nasāʾī, ʿAmal al-Yawm wa'l-Laylah, p. 173; see Irwāʾ al-Ghalīl 1/135, 2/94