Leviticus 23:3-5

Young's Literal Translation

³ six days is work done, and in the seventh day [is] a sabbath of rest, a holy convocation; ye do no work; it [is] a sabbath to Jehovah in all your dwellings.

⁴ `These [are] appointed seasons of Jehovah, holy convocations, which ye proclaim in their appointed seasons:

⁵ in the first month, on the fourteenth of the month, between the evenings, [is] the passover to Jehovah;