Yesterday there came around in the Office of Readings the instructions for the Passover in Exodus chapter 12.
This is how you are to eat it: with your loins girt, sandals on your feet and your staff in hand, you will eat it in a hurry. It is the LORD’s Passover. (Exodus 12:11)
The Passover is eaten like those in flight, fleeing from the oppression and slavery of Egypt, reeling with God's plagues, into the long journey that will one day bring God's people into the Promised Land.