Leviticus 23:4-9

⁴These also are the holy days of the Lord, which you must celebrate in their seasons.

⁵The first month, the fourteenth day of the month at evening, is the phase of the Lord:

⁶And the fifteenth day of the same month is the solemnity of the unleavened bread of the Lord. Seven days shall you eat unleavened bread.

⁷The first day shall be most solemn unto you, and holy: you shall do no servile work therein:

⁸But you shall offer sacrifice in fire to the Lord seven days. And the seventh day shall be more solemn, and more holy: and you shall do no servile work therein.

⁹And the Lord spoke to Moses, saying: