Theodoret of Cyrus
Why did God instruct the Israelites on the run to observe the Passover? It delighted Him that the act of salvation should be remembered eternally. To affirm this, He commanded: “If your son asks you, ‘What is the Passover?’ you shall say, ‘On this day, the Lord our God brought our ancestors out of the land of Egypt and spared our firstborn when the Destroyer struck down the firstborn of Egypt.’” Consequently, those who partake in this celebration are instructed to embody a state of readiness for the journey ahead. It is written: “You shall eat it in haste; it is the Lord's Passover” (Ex. 12:11).