Musnad Ahmad 30:3014

Yahya narrated to us, from Muhammad—meaning Ibn ‘Amr—who said: Abu Salamah narrated to me, from Abu Hurairah, from the Prophet (peace and blessings of Allah be upon him), who said: "Do not prevent the female servants of Allah from the mosques of Allah, and let them go out while they are *tafilat* (unperfumed/not wearing scent)."