Sayyid al-Istighfar
اللَّهُمَّ أَنْتَ رَبِّي لَا إِلَهَ إِلَّا أَنْتَ، خَلَقْتَنِي وَأَنَا عَبْدُكَ
Allaahumma anta rabbee laa ilaaha illaa anta, khalaqtanee wa anaa 'abduk.
O Allah, You are my Lord, there is no god but You. You created me and I am Your servant.
Source: Sahih al-Bukhari 6306