Leviticus 25:9

⁹and thou shalt sound with a clarion in the seventh month, in the tenth day of the month, in the time of propitiation, that is, (in the time of) mercy, in all your land. (and thou shalt sound with a trumpet in the seventh month, on the tenth day of the month, that is, on the Day of Cleansing, or the Day of Atonement, in all your land.)