Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.058A.
Section : A man leading a group of women in prayer.
Abu Ya’ la and at-Tabarani, in al-Ausat, record, with a hasan chain, that Ubayy ibn Ka’b came to the Messenger of Allah and said: “O Messenger of Allah, I did something last night.” The Prophet asked: “What was that?” He said: “The women in my house said, ‘You recite and we do not recite so lead us in salah. ‘So I prayed eight rak’atand witr (with them).” The Prophet remained silent, and Ka’b said: “We took his silence as a sign of his approval.”