1911 Encyclopædia Britannica, Volume 6… (1911)
“ The custom is first mentioned in the pseudo-Nicene Arabic canons. No ancient form of service exists, and that which figures in the English prayer-book of to-day dates only from the middle ages. Custom differs, but the usual date of churching was the fortieth day after confinement, in accordance with the Biblical date of the presentment of the Virgin Mary and the Child Jesus at the Temple. It was formerly regarded as unlucky for a woman to leave her house to go out at all after confinement till she went to be churched. It was not unusual for the churching service to be said in private houses. ”
