One of the most useful things a targum does is flag which commandments were meant to last forever and which were meant only for a single moment. Targum Pseudo-Jonathan on Exodus 12:3 makes that distinction explicit. On the tenth of Nisan, Israel was commanded to take a lamb for each household — but the Aramaic specifies, "whose time is appointed for this time (occasion), and not for (coming) generations."
In other words, the selection of the lamb four days in advance was a one-time rite. Future generations would slaughter the Pesach offering and observe the seder, but they would not be required to set aside the lamb on the tenth. That was a command tied to the first night only.
Why did that night require the four-day preparation? The rabbis understood it as an act of courage. The lamb was sacred to Egyptian religion. To tie one to the bedpost of a Hebrew house for four days was to publicly declare, "I am no longer afraid of the gods of my masters." The Targum will return to this point explicitly at Exodus 12:6.
The verse also introduces the household as the unit of observance. Not the tribe, not the nation, but the bayit — the house. Each household takes a lamb. If many, a lamb per house. If few, a shared lamb. Passover begins inside the home because freedom begins inside the home.
Takeaway: Not every commandment is forever. Some are built for one terrifying night that the rest of history remembers.