...September Haleg-monath... (Bede, De temporum ratione (The Reckoning of Time), Ch. 15)

On ðæm nigoþan mónþe on geáre biþ xxx daga se mónaþ hátte on léden septembris and on úre geþeóde háligmónaþ for ðon ðe úre yldran ðá ðá hí hǽðene wǽron on ðam mónþe hí guldon hiora deófolgeldum
In the 9th month in a year there are 30 days. The month is called September in Latin and, in our language, Holy Month, because our forefathers—when they were pagan—sacrificed in that month to their idols. (Menologium in O. Cockayne's The Shrine, p. 124, ll. 28–31)