Thematic Bible: Passover first commemorated

And the LORD spoke unto Moses in the wilderness of Sinai, in the first month of the second year after they were come out of the land of Egypt, saying, Let the children of Israel also keep the passover at its appointed time. In the fourteenth day of this month, at evening, you shall keep it in its appointed time: according to all its rites, and according to all its ceremonies, shall you keep it. read more.
And Moses spoke unto the children of Israel, that they should keep the passover. And 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 did the children of Israel.