Leviticus 23:37-40

37“These are the moadim of Adonai, which you are to proclaim to be holy convocations, to present an offering by fire to Adonai—a burnt offering, a grain offering, a sacrifice and drink offerings, each on its own day,

38besides those of the Shabbatot of Adonai and besides your gifts, all your vows and all your freewill offerings which you give to Adonai.

39“So on the fifteenth day of the seventh month, when you have gathered in the fruits of the land, you are to keep the Feast of Adonai for seven days. The first day is to be a Shabbat rest, and the eighth day will also be a Shabbat rest.

40On the first day you are to take choice fruit of trees, branches of palm trees, boughs of leafy trees, and willows of the brook, and rejoice before Adonai your God for seven days.