Reference : Hisn al-Muslim 42

سُبْـحانَكَ اللّهُـمَّ رَبَّـنا وَبِحَـمْدِكَ ، 
اللّهُـمَّ اغْفِرْ لي
Subḥānaka Allāhumma Rabbanā wa biḥamdika 
Allāhumma ‘ghfir lī.


Glory is to You, O Allah, our Lord, and praise is Yours. 
O Allah, forgive me.

Reference:
Al-Bukhari and Muslim, see invocation no. 34 above.

Chapter: While prostrating