The supplication in the two prostrations of forgetfulness and what is said between them

The questioner:
Before we move on to the new chapter, the chapter on voluntary prayer, can you recall the supplication prescribed for the two prostrations of forgetfulness and for what is said between them?

The Shaykh:
Yes, well done. This is something people ask about often, thinking that there is a difference between the prostration of forgetfulness and the prostration in prayer? This is a mistake. There is no difference between the prostration of forgetfulness and the prostration in prayer, neither in the manner nor in what is said in it. One says, "Subhan Rabbi al-A'la" (Glory be to my Lord, the Most High) once or three times, or as much as one wishes, and supplicates for oneself and for whoever one wishes to supplicate for, exactly as one does in prayer. Yes.

The questioner:
And what is said between them, between the two prostrations of forgetfulness?

The Shaykh:
Say, "My Lord, forgive me." Praise be to Allah.