Exodus 13:10

‘Now this day will be a memorial to you, and you shall celebrate it as a feast to Yahweh; throughout your generations you are to celebrate it as a perpetual statute.

‘You shall also keep the Feast of Unleavened Bread, for on this very day I brought your hosts out of the land of Egypt; therefore you shall keep this day throughout your generations as a perpetual statute.

“And you shall keep this event as a statute for you and your children forever.

It is a night to be kept for Yahweh for having brought them out from the land of Egypt; this night is for Yahweh, to be kept by all the sons of Israel throughout their generations.