The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1390
Abdullah b. al-Mukhtar heard Musa b. Anas narrating on the authority of Anas b. Malik that the Messenger of Allah (may peace be upon him) led him, his mother or his aunt in prayer. He made me, stand on his right side and made the woman stand, behind us.