Leviticus 16:29-30

29“And it shall be a statute to you forever that ain the seventh month, on the tenth day of the month, you shall bafflict yourselves
Or  shall fast; also verse 31
and shall do no work, either dthe native or the stranger who sojourns among you.
30For on this day shall atonement be made for you eto cleanse you. You shall be clean before the Lord from all your sins.

Leviticus 25:9

9Then you shall sound fthe loud trumpet on the tenth day of the seventh month. gOn the Day of Atonement you shall sound the trumpet throughout all your land.

Numbers 29:7-11

Offerings for the Day of Atonement

7 h“On the tenth day of this seventh month you shall have a holy convocation and iafflict yourselves.
Or  and fast
You shall do no work,
8but you shall offer a burnt offering to the Lord, a pleasing aroma: one bull from the herd, one ram, seven male lambs a year old: ksee that they are without blemish. 9And their grain offering shall be of fine flour mixed with oil, three tenths of an ephah for the bull, two tenths for the one ram, 10a tenth for each of the seven lambs: 11also lone male goat for a sin offering, besides mthe sin offering of atonement, and the regular burnt offering and its grain offering, and their drink offerings.

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