Is the prostration of forgetfulness (sujud al-sahw) obligatory before the taslim if I doubted saying "Subhana Rabbiyal-A'la" (Glory be to my Lord, the Most High) during prostration in the first rak'ah, and I mostly believe that I did not say it, and I am now in the second rak'ah, knowing that the rule states: "If you doubt during prayer and one of the two matters becomes more likely to you, then act according to what became more likely to you, and perform the prostration of forgetfulness after the taslim"?
The prostration of forgetfulness (Sujud al-Sahw) is not obligatory for someone who doubts having omitted a duty, such as doubting whether they said "Rabb ighfir li" (Lord, forgive me); because the default is that the prostration of forgetfulness is not obligatory. The place for the prostration of forgetfulness is for preferability, so if the worshipper prostrates before or after the salutations, their prayer is valid.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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