Exodus 12:42
That was for the LORD a night of vigil to bring them out of the land of Egypt. This same night belongs to the LORD, and is to be a vigil for all the Israelis from generation to generation.
Deuteronomy 16:1-6
You are not to sacrifice to the LORD your God an ox or a sheep that has a defect or any flaw in it, because that is detestable to the LORD your God."
Exodus 12:14
""This day is to be a memorial for you, and you are to celebrate it as a festival to the LORD. You are to celebrate it as a perpetual ordinance from generation to generation.
Exodus 13:10
You are to keep this ordinance at its appointed time from year to year."