'Day of Atonement' in the Bible

However on the tenth day of this seventh month is the day of atonement. It shall be a holy convocation to you, and ye shall afflict your souls, and ye shall offer an offering made by fire to LORD.

And ye shall do no manner of work in that same day, for it is a day of atonement, to make atonement for you before LORD your God.

Then thou shall send abroad the loud trumpet on the tenth day of the seventh month. In the day of atonement ye shall send abroad the trumpet throughout all your land.