It is narrated from the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), that the Prophet (peace and blessings be upon him) made an error before completion (before the prayer was complete), so he (peace and blessings be upon him) performed the two prostrations of forgetfulness before giving the salam, and said: "Whoever makes an error before the prayer is complete should perform the two prostrations of forgetfulness before giving the salam, and when the error occurs after the prayer is complete, he should perform the two prostrations of forgetfulness after giving the salam."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Hisham bin Urwah with these words except Isa bin Maymun, and Hatim is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 7593
Hadith Gradingمحدثین:إسناده ضعيف لضعف عيسى بن ميمون
Hadith Takhrij«قال الهيثمي: وفيه عيسى بن ميمون واختلف في الاحتجاج به وضعفه الأكثر «مجمع الزوائد ومنبع الفوائد، ج 2، ص 153»»