The sons of Aaron can only work in the meeting tent between the ages of 25 and 50. I wonder what that says about life expectancy, at least when the text was written, although something like this is a thing that probably could have been passed down year after year.
Interesting anachronism, God tells Moses what the Hebrews should do regarding Passover celebration when they (or their descendants) are travelling in a foreign country. I mean, the Israelites did not have a country yet, let alone an opportunity to travel to foreign countries.
But, the big news is that we’ve moved on from Sinai to Paran. Moses asks his father-in-law to stick with them–who remember he was still there. God is still understood as inhabiting a particular space. Indeed, the passage closes with this phrasing that makes it sound very much like YHWH is a genie in a bottle that is the Ark of the Covenant.
And whenever the ark set out, Moses said, “Arise, O Lord, and let your enemies be scattered, and let those who hate you flee before you.” And when it rested, he said, “Return, O Lord, to the ten thousand thousands of Israel.”