Musannaf Ibn Abi Shayba 3:2571

Abu Dawud al-Tayalisi narrated to us, from Shu'bah, from 'Abdullah ibn al-Mukhtar, from Musa ibn Anas, from Anas, that the Prophet (ﷺ) led them in prayer, and a woman from his family [was with them]. He placed Anas on his right, and the woman behind him.