Numbers 9:1-3

1Thus the Lord spoke to Moses in the wilderness of Sinai, in 1the first month of the second year after they had come out of the land of Egypt, saying,

2“Now, let the sons of Israel observe the Passover at 2its appointed time.

3On the fourteenth day of this month, 3at twilight, you shall observe it at its appointed time; you shall observe it according to all its statutes and according to all its ordinances.”