Leviticus 23:27

Also on the tenth day of this seventh month there shall be a day of atonement: it shall be an holy convocation unto you; and ye shall afflict your souls, and offer an offering made by fire unto Yahuah.

Leviticus 23:28

And ye shall do no work in that same day: for it is a day of atonement, to make an atonement for you before Yahuah your Elohim.