سُبْحَانَكَ اللَّهُمَّ رَبَّنَا وَبِحَمْدِكَ اللَّهُمَّ اغْفِرْ لِي

How Perfect You are O Allāh, our Lord, and I praise You. O Allāh, forgive me.

Reference: Al-Bukhārī (#794, 1/99) and Muslim (#484, 1/350).