Numbers 9:3-5

Revised Standard Version

³ On the fourteenth day of this month, in the evening, you shall keep it at its appointed time; according to all its statutes and all its ordinances you shall keep it.” ⁴ So Moses told the people of Israel that they should keep the passover. ⁵ And they kept the passover in the first month, on the fourteenth day of the month, in the evening, in the wilderness of Sinai; according to all that the Lord commanded Moses, so the people of Israel did.