Musannaf Ibn Abi Shayba 3:3775

Marwan ibn Mu'awiyah narrated to us, from 'Umar ibn 'Abd Allah al-Thaqafi, who said: 'Arfajah narrated to us. He said: 'Ali used to command the people to perform the standing of Ramadan (Tarawih), and he would appoint an imam for the men and an imam for the women. 'Arfajah said: So 'Ali commanded me, and I was the imam for the women.