What is your ruling on one who makes a mistake during the third rak'ah of the prayer?
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The questioner : What is your ruling on one who makes a mistake during the third rak'ah of the prayer? Does he repeat the prayer, or what does he do?
The Shaykh : We do not know what mistake you are referring to. The mistake may be one that does not invalidate the prayer, such as if one makes a mistake and says, "Subhan Rabbi al-Azim" (Glory be to my Lord, the Great) during prostration, then returns and says, "Subhan Rabbi al-A'la" (Glory be to my Lord, the Most High). This does not affect her prayer, and the most that is required is that it is recommended for her to perform the prostration for forgetfulness.
The mistake may also be the omission of a pillar. If it is the omission of a pillar, then it is necessary to perform it if she catches up with it in that rak'ah; otherwise, the second rak'ah takes its place. The important point is that the mistake was not specified in the question, but we have mentioned something from which the answer can be understood.
The Shaykh : We do not know what mistake you are referring to. The mistake may be one that does not invalidate the prayer, such as if one makes a mistake and says, "Subhan Rabbi al-Azim" (Glory be to my Lord, the Great) during prostration, then returns and says, "Subhan Rabbi al-A'la" (Glory be to my Lord, the Most High). This does not affect her prayer, and the most that is required is that it is recommended for her to perform the prostration for forgetfulness.
The mistake may also be the omission of a pillar. If it is the omission of a pillar, then it is necessary to perform it if she catches up with it in that rak'ah; otherwise, the second rak'ah takes its place. The important point is that the mistake was not specified in the question, but we have mentioned something from which the answer can be understood.