Then Moses called for all the elders of Israel and said to them, “Bring out and take for yourselves lambs according to your families and slaughter the Passover lamb.
On the fourteenth day of this month, at twilight, you shall observe it at its appointed time; you shall observe it according to all its statutes and according to all its judgments.”
And they celebrated the Passover in the first month, on the fourteenth day of the month, at twilight, in the wilderness of Sinai; according to all that Yahweh had commanded Moses, so the sons of Israel did.