One who prays behind the imam and then forgets: does he prostrate for forgetfulness?

The questioner : A second question. Raise your voice.

The Shaykh : Yes.

The questioner : The ma'mum (one praying behind the imam) equalized with the imam, one unit, two units in prostration, equalized one? No.

The Shaykh : I do not know what he asked? What did he ask? What did he ask about?

The questioner : I mean, for example, a person, I mean, he has not yet bowed with the imam.

The Shaykh : The one who did not bow must, when the imam concludes the prayer, perform a rak'ah in place of the rak'ah in which he left off the bowing, because bowing is a pillar. And when he performs this rak'ah, he testifies and concludes the prayer, then he prostrates two prostrations for forgetfulness. As for if he left off the takbir other than the takbir of entering prayer, or the tasbih in the bowing or prostration, then if he did not miss anything of the prayer, he owes no prostration for forgetfulness, because the imam bears it for him. And if he did miss something, then when he completes his prayer, he prostrates two prostrations before he concludes the prayer.