Leviticus 23:24
23 And Yahovah spake unto Moses, saying,
24 Speak unto the children of Israel, saying, In the seventh month, in the first day of the month, shall ye have a sabbath, a memorial of blowing of trumpets, an holy convocation.
25 Ye shall do no servile work therein; but ye shall offer an offering made by fire unto Yahovah.