Leviticus 23:39-40

³⁹“‘So on the fifteenth day of the seventh month, when you have gathered in the fruits of the land, you shall keep the feast of the LORD seven days. On the first day shall be a solemn rest, and on the eighth day shall be a solemn rest.

⁴⁰You shall take on the first day the fruit of majestic trees, branches of palm trees, and boughs of thick trees, and willows of the brook; and you shall rejoice before the LORD your God seven days.