'Day of Atonement' in the Bible

“The tenth day of this seventh month is the Day of Atonement. You are to hold a sacred assembly and practice self-denial; you are to present a fire offering to the Lord.

On this particular day you are not to do any work, for it is a Day of Atonement to make atonement for yourselves before the Lord your God.

Then you are to sound a trumpet loudly in the seventh month, on the tenth day of the month; you will sound it throughout your land on the Day of Atonement.