Numbers 29:35

On the eighth day ye shall have a solemn assembly: ye shall do no servile work therein:

Cross-reference

Leviticus 23:36 is the parallel law prescribing the same eighth-day solemn assembly for the Feast of Tabernacles with identical language.

John 7:37 Prophetic fulfillment

In John 7:37, Jesus stands on the last great day of the feast (the eighth day) and invites the thirsty to come to Him, fulfilling the feast's water imagery.

Nehemiah 8:18 Historical context

Nehemiah 8:18 records the actual observance of the eighth-day solemn assembly when the feast was restored — a historical fulfillment of this command.