The ruling on doubt regarding the number of rak'ahs
Machine translationRead the Arabic original
Question:
It was said that he should find every questioner who might reward him in his prayer, but he did not find Ishaq for three [units] or two [units]; so what should he do?
Answer:
If the doubt arises while he is praying, he should build upon certainty, which is the lesser number. So if he doubts whether he prayed three or four [units], he makes it three, performs the fourth, and prostrates for forgetfulness. But if the doubt did not occur until after the prayer was finished, then this has no effect; doubt after completing the act of worship has no effect. Yes.
It was said that he should find every questioner who might reward him in his prayer, but he did not find Ishaq for three [units] or two [units]; so what should he do?
Answer:
If the doubt arises while he is praying, he should build upon certainty, which is the lesser number. So if he doubts whether he prayed three or four [units], he makes it three, performs the fourth, and prostrates for forgetfulness. But if the doubt did not occur until after the prayer was finished, then this has no effect; doubt after completing the act of worship has no effect. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، 062 من 123 / شرح كتاب زاد المستقنع / البيع / الشركة / صالح الفوزان / الفقه / كبار العلماء — youtube.com (57:45)
The Arabic text is a machine transcription of the audio recording.