Exodus 30:10
And Aaron shall make an atonement on the horns of it once in a year with the blood of the sin offering of atonements: once in the year shall he make atonement on it throughout your generations: it is most holy to the LORD.
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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 to you; and you shall afflict your souls, and offer an offering made by fire to the LORD.
Nave's Topical Index—AKJV

Leviticus 25:9
Then shall you cause the trumpet of the jubilee to sound on the tenth day of the seventh month, in the day of atonement shall you make the trumpet sound throughout all your land.
Nave's Topical Index—AKJV

Numbers 29:7
And you shall have on the tenth day of this seventh month an holy convocation; and you shall afflict your souls: you shall not do any work therein:
Nave's Topical Index—AKJV