Exodus 12:1

And the Lord spake unto Moses and Aaron in the land of Egypt,.... Before they and the children of Israel came out of it, before the slaying of the firstborn, yea, before Moses came from the presence…

This chapter was written some time after the Exodus, probably when Moses put together the portions of the book toward the end of his life. The statements that these instructions were given in the land…

Moses and Aaron here receive of the Lord what they were afterwards to deliver to the people concerning the ordinance of the passover, to which is prefixed an order for a new style to be observed in…