Reciting al-Hamd aloud in the third rak‘a
Question
An imam, standing in the third rak‘a, recited al-Hamd aloud; after reciting two or three verses the imam remembered and fell silent. What needs to be clarified is whether sajda al-sahw (the prostration of forgetfulness) will be wajib or not.
Answer
If he recited three verses aloud, sajda al-sahw will be necessary (lazim).
Source: Fatawa Mahmudiyya
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