Musnad Ahmad 27:572

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from Sulayman, from Mujahid, from Ibn 'Umar, from the Prophet, may Allah bless him and grant him peace, that he said: "Do not prevent your women from the mosques at night." Salim, or one of his sons, said: "By Allah, we will not let them take it as a means of corruption." He (Ibn 'Umar) struck his chest and said: "I narrate to you from the Messenger of Allah, may Allah bless him and grant him peace, and you say this!"