Leviticus 23:33-38

³³And the Lord spoke to Moses, saying:

³⁴Say to the children of Israel: From the fifteenth day of this same seventh month, shall be kept the feast of tabernacles seven days to the Lord.

³⁵The first day shall be called most solemn and most holy: you shall do no servile work therein. And seven days you shall offer holocausts to the Lord.

³⁶The eighth day also shall be most solemn and most holy, and you shall offer holocausts to the Lord: for it is the day of assembly and congregation: you shall do no servile work therein.

³⁷These are the feasts of the Lord, which you shall call most solemn and most holy, and shall offer on them oblations to the Lord, holocausts and libations according to the rite of every day,

³⁸Besides the sabbaths of the Lord, and your gifts, and those things that you offer by vow, or which you shall give to the Lord voluntarily.