'Day of Atonement' in the Bible

"The tenth day of this seventh month is the Day of Atonement. It is to be a holy assembly for you, and you must humble yourselves and present a gift to the Lord.

You must not do any work on this particular day, because it is a day of atonement to make atonement for yourselves before the Lord your God.

You must sound loud horn blasts -- in the seventh month, on the tenth day of the month, on the Day of Atonement -- you must sound the horn in your entire land.