Exodus 12:42

Because the Lord kept a vigil that night to bring them out of the land of Egypt, this same night is to be a vigil to the Lord, to be observed by all the Israelites for the generations to come.
BSB · Berean Standard Bible
It is a night to be much observed unto the Lord for bringing them out from the land of Egypt: this is that night of the Lord to be observed of all the children of Israel in their generations.

Note a night…: Heb. a night of observations

KJV · King James Version
It is a night to be much observed to the Lord for bringing them out from the land of Egypt. This is that night of the Lord, to be much observed by all the children of Israel throughout their generations.
WEB · World English Bible
It is a night to be much observed unto Jehovah for bringing them out from the land of Egypt: this is that night of Jehovah, to be much observed of all the children of Israel throughout their generations.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

a night to be much observed
Heb. a night of observations.observed.
Exodus 12:14; Deuteronomy 16:1–6