Leviticus 23:25

Ye shall do no servile work there in; but ye shall offer an offering made by fire unto the Lord. The day was afterward, if not at that time, celebrated as the Sew Year's Day of the civil year, and the solemn assembly marked its prominence, as the Jews said, because it commemorated the creation, when all the sons of God shouted for joy, Job 38:7. The blowing of horns was afterward not confined to the Sanctuary, but was indulged in very generally throughout the land. The burnt offering of the day is specified exactly in Numbers 29:1.