Exodus 12:42
A night of solemn observances, it is unto Yahweh, for bringing them forth out of the land of Egypt, - this same night, pertaineth to Yahweh, for solemn observances by all the sons of Israel to their generations.
Deuteronomy 16:1-6
Observe the month of Abib, when thou shalt keep a passover unto Yahweh thy God, - for in the month of Abib, did Yahweh thy God bring thee forth out of Egypt by night:
Exodus 12:14
So shall this day serve you for a memorial, and ye shall celebrate it, as a festival to Yahweh, - to your generations - as an age-abiding statute, shall ye celebrate it.
Exodus 13:10
So shalt thou observe this statute in its appointed time, - from year to year.