Bede

From the first day of the seventh month they began the burnt offering, etc. It has often been said that the seventh month designates the sevenfold illumination of spiritual grace. Hence it is well said now: Because from the first day of the seventh month they began to offer a burnt offering to the Lord, since indeed from the very beginning of divine inspiration, it is necessary that the human conscience be transformed, and disregarding lower pleasures, it must burn with thoughts only of the Lord's matters. …

Commentary on Ezra and Nehemiah ↗