Leviticus 23:23-25 - The Feast Of Trumpets
23 Then Yahweh spoke to Moses, saying, 24 "Speak to the {Israelites}, saying, 'In the seventh month, on [the] first [day] of the month, {you must have} a rest period, a remembrance of [the trumpet] blast, a holy assembly. 25 You must not do {any regular work}, and you shall present an offering made by fire to Yahweh.'"