Musnad Ahmad 939:9

Rab'i (meaning Ibn Ibrahim) narrated to us, Abd al-Rahman ibn Ishaq narrated to us, from Muhammad ibn Abdullah ibn Amr ibn Hisham, from Busr ibn Sa'id, from Zayd ibn Khalid al-Juhani, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Do not prevent the female servants of Allah from the mosques, and let them go out while they are not perfumed."