اَللّٰهُمَّ لَكَ سَجَدْتُ وَ بِكَ آمَنْتُ وَ لَكَ اَسْلَمْتُ

aalllhuma lak sajadt w bik amant w lak aaslamt

O Allah! I have prostrated before You, and believed in You and submitted myself to You.

In Awaarif al-Ma’arif: Ameer al-Moameneen (a.s.) narrated:
The Holy Prophet (s.a.w.a.) used to say in his sajdah :

سَجَدَ وَجْهِيَ لِلَّذِيْ خَلَقَهٗ وَ صَوَّرَهٗ وَ شَقَّ

sajad wajhi liladhi khalaqah w sawarah w shaqa

My face has prostrated to the One who created it and fashioned it, giving it (the power of)

سَمْعَهٗ وَ بَصَرَهٗ فَتَبَارَكَ اللهُ اَحْسَنُ الْخالِقِيْنَ.

sameah w basarah fatabarak allh aahsan alkhaliqina.

hearing and sight; so blessed is Allah the best of Creators.