The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fada'il Al-Sahabah)
Muslim :: Book 31 : Hadith 5900
Abu Huraira reported that Umar b. Khattab came to Allah's Messenger (may peace be upon him) while there were some women with him and they were raising their voices above the voice of Allah's Messenger (may peace be upon him) and when Umar sought permission to get into the house they went behind the curtain hurriedly. The rest of the hadith is the same.