Leviticus 23:26

The LORD spoke to Moses, saying,

“Speak to the children of Israel, saying, ‘In the seventh month, on the first day of the month, there shall be a solemn rest for you, a memorial of blowing of trumpets, a holy convocation.

You shall do no regular work. You shall offer an offering made by fire to the LORD.’”

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

You shall do no kind of work in that same day, for it is a day of atonement, to make atonement for you before the LORD your God.

For whoever it is who shall not deny himself in that same day shall be cut off from his people.