Musnad Abu Ya'la al-Mawsili 108:34

Ubayy ibn Ka'b came to the Messenger of Allah (may Allah bless him and grant him peace) and said: "O Messenger of Allah, something happened with me last night," meaning during Ramadan. He said: "And what was that, O Ubayy?" He said: "Some women in my house said: 'We do not recite the Quran, so we will pray with your prayer.' So I prayed with them eight rak'ahs, then I performed the witr." He said: "It was as if he was pleased, and he did not say anything."