Numbers 9:1-3

New Revised Standard Version, Anglicised Catholic Edition

The Passover at Sinai

9 The Lord spoke to Moses in the wilderness of Sinai, in the first month of the second year after they had come out of the land of Egypt, saying: ² Let the Israelites keep the passover at its appointed time. ³ On the fourteenth day of this month, at twilight,^[a] you shall keep it at its appointed time; according to all its statutes and all its regulations you shall keep it.