It is narrated from the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), that she said: "I complained to the Messenger of Allah (peace and blessings be upon him) of forgetfulness (lapses) in the prayer, and he (peace and blessings be upon him) said: 'When you pray and it seems to you that you have completed your prayer while you are in doubt, recite the tashahhud and give the salam, then perform two prostrations while sitting, then recite the tashahhud between them and give the salam.'"
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyidah Aishah (may Allah be pleased with her) only with this chain, through the narration of Musa bin Mutayr (may Allah have mercy on him)."
Hadith Referenceالمعجم الأوسط / باب العين / 4392
Hadith Gradingمحدثین:إسناده ضعيف جدًّا، فيه موسى بن مطير متروك
Hadith Takhrij«قال الهيثمي: وفيه موسى بن مطير وهو متروك الحديث نسب إلى الوضع «مجمع الزوائد ومنبع الفوائد، ج 2، ص 153»»