Leviticus 23:3-5

King James Version

³ Six days shall work be done: but the seventh day is the sabbath of rest, an holy convocation; ye shall do no work therein: it is the sabbath of the Lord in all your dwellings.

⁴ These are the feasts of the Lord, even holy convocations, which ye shall proclaim in their seasons.

⁵ In the fourteenth day of the first month at even is the Lord's passover.