If a person forgets a unit of prayer (rak'ah) from his prayer, whether out of ignorance or forgetfulness, and then leaves the mosque immediately after the closing salam of the prayer, meaning he did not stay for a long time, and then
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The questioner : If a person forgets a unit of prayer (rak'ah) from his prayer, whether out of ignorance or forgetfulness, and then leaves the mosque immediately after the closing salam of the prayer, meaning he did not stay for a long time, and then returns, does he pray one unit and perform the prostration for forgetfulness, or does he repeat the prayer from the beginning?
The Shaykh : If the interval was not long and he returned as soon as he remembered, then he completed his prayer, his prayer is valid, and he must perform the prostration for forgetfulness after the salam.
As for if the interval was long, or if he committed an act that breaks ritual purity, he must repeat the prayer from the beginning. And if he committed an act that breaks ritual purity, he must perform the ablution for prayer (wudu') and then repeat the prayer from the beginning.
The questioner : Your Eminence, what is the approximate duration of the interval?
The Shaykh : The interval is determined by custom; that is, five minutes or four minutes is considered long.
The Shaykh : If the interval was not long and he returned as soon as he remembered, then he completed his prayer, his prayer is valid, and he must perform the prostration for forgetfulness after the salam.
As for if the interval was long, or if he committed an act that breaks ritual purity, he must repeat the prayer from the beginning. And if he committed an act that breaks ritual purity, he must perform the ablution for prayer (wudu') and then repeat the prayer from the beginning.
The questioner : Your Eminence, what is the approximate duration of the interval?
The Shaykh : The interval is determined by custom; that is, five minutes or four minutes is considered long.