Leviticus 23:23-25 - The Feast Of Trumpets
23 And the Lord said to Moses, 24 Say to the children of Israel, In the seventh month, on the first day of the month, let there be a special day of rest for you, a day of memory, marked by the blowing of horns, a meeting for worship. 25 Do no field-work and give to the Lord an offering made by fire.