Numbers 9:1-3

Young's Literal Translation

9 And Jehovah speaketh unto Moses, in the wilderness of Sinai, in the second year of their going out of the land of Egypt, in the first month, saying,

² `Also, the sons of Israel prepare the passover in its appointed season;

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.'