Abu Dawud
Purification (Kitab Al-Taharah)
Book Number: 001 / Hadith Number: 368
Narated By 'Aisha : The Prophet (pbuh) would not pray in our quilts. Hammad said: I heard Sa'id b. Abi Sadaqah say: I asked Muhammad (b. Sarin) about it. He did not narrate it to me, but said: I heard it a long time ago and I do not know from whom I heard it. I do not know whether I heard it from a trustworthy person or not. Make an inquiry about it.