It is narrated from the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), that the Messenger of Allah (peace and blessings be upon him) used to pray wherever he happened to be near in the house. So Sayyidah Aishah (may Allah be pleased with her) said to him (peace and blessings be upon him): "O Messenger of Allah, at times you pray in a place where a menstruating woman passes. If only you would set aside a particular place for praying." He (peace and blessings be upon him) said: "O Aishah, I am surprised at you! Do you not know that the prostration of a believer purifies that place down to the seven earths?"
Imam al-Tabarani (may Allah have mercy on him) said: "Ma'bad (may Allah have mercy on him) did not narrate any hadith from Sayyidah Aishah (may Allah be pleased with her) other than this, and no one narrated it from Ma'bad (may Allah have mercy on him) except his son Zuhrah (may Allah have mercy on him); Layth (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 8687
Hadith Gradingمحدثین:إسناده ضعيف لضعف عبد الله بن صالح كاتب الليث
Hadith Takhrij«قال الهيثمي: رواه الطبراني في الأوسط وعبد الله بن صالح ضعفه الجمهور وقال عبد الملك بن شعيب ثقة مأمون «مجمع الزوائد ومنبع الفوائد، ج 2، ص 7»» «أخرجه الطبراني فى «الأوسط» برقم: 4951»