Sayyiduna Mughirah bin Shu’bah (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said:“When the imam stands up after performing two rak‘ahs (instead of sitting), if he remembers before standing up completely, he should sit down; but if he has stood up completely, then he should not sit down and should perform sajdah sahw (prostration of forgetfulness) afterwards.”Other narrators have transmitted it in the same way.