What is the ruling on one who sat for the tashahhud and remembered that he had prayed only one rak'ah?

The questioner : Peace be upon you.

The Shaykh : And upon you be peace. He says: Honorable Shaykh, if a woman stands for prayer, Honorable Shaykh, and she prays one rak'ah and remembers this in the tashahhud, what is required of her? Does she prostrate for forgetfulness?

The questioner : Did you pray one and then say the taslim, or not?

The Shaykh : No, she did not say the taslim.

The questioner : I mean, she sat for the tashahhud.

The Shaykh : Yes, Shaykh.

The questioner : Then she remembered that she had not prayed except one rak'ah.

The Shaykh : Yes, Shaykh.

The questioner : Abu. The night prayer. She stands and completes a rak'ah.

The Shaykh : Yes.

The questioner : And she prostrates for forgetfulness after the taslim.

The Shaykh : After the taslim.

The presenter : The question, the question. His day is considered, the Exalted. Fine. If Allah wills.