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3. Rulings about Forgetfulness during Prayer (al-sahw)
Doubt about number of rak’ahs prayed
If a person is in doubt as to whether he prayed, for example, three or four rak’ahs, he should act according to what is most likely. However, if he cannot be sure which is more likely, he should assume what he can be certain of, which is the lesser amount, and make the prostrations of forgetfulness (sujood ul-sahw).
The evidence is the hadeeth narrated by Abu Sa‘eed Al-Khudri (may Allah be pleased with him), who said: “The Prophet (peace and blessings of Allaah be upon him) said: ‘If one of you has doubts during his prayer and he does not recall how many rak‘ahs he has prayed, whether three or four, then should forget about his doubt and complete his prayer on the basis of that of which he is certain, and then make two sujood before the salaam. If it turns out that he had prayed five rak‘ah, the two sujood would make it even, and if he ended up completing his four rak‘ahs , they would be in defiance of the Shaytaan.’” (Saheeh Muslim, no. 571)