Then Moses called for all the elders of Israel and said to them, “Draw out and take for yourselves a lamb according to your families and kill the Passover lamb.
On the fourteenth day of this month, at evening, you will keep it at its appointed time. According to all its rites and according to all its ceremonies, you will keep it.
They kept the Passover on the fourteenth day of the first month at evening in the Wilderness of Sinai. According to all that the Lord commanded Moses, so the Israelites did.