Is it permissible for a worshiper who has performed the prostration of forgetfulness (sujud al-sahw) and then made the taslim (greeting of peace) to return to prostration again if he doubts whether he completed the prostration of forgetfulness, and is his prayer valid?
If you doubt whether you performed the second prostration of forgetfulness (sujud al-sahw) before the salutation (taslim), then you must perform it. However, if the doubt occurs after the salutation, it is not given any consideration, and the prayer is valid in all cases.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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