Numbers 9:3-5

Young's Literal Translation

³ in the fourteenth day of this month between the evenings ye prepare it in its appointed season; according to all its statutes, and according to all its ordinances ye prepare it.'

⁴ And Moses speaketh unto the sons of Israel to prepare the passover,

⁵ and they prepare the passover in the first [month], on the fourteenth day of the month, between the evenings, in the wilderness of Sinai; according to all that Jehovah hath commanded Moses, so have the sons of Israel done.