solemn assembly
Leviticus 23:36
Seven days ye shall offer an offering made by fire unto the LORD. On the eighth day shall be a holy convocation unto you, and ye shall offer an offering made by fire unto the LORD. It is a solemn assembly, and ye shall do no servile work therein.
Deuteronomy 16:8
Six days thou shalt eat unleavened bread, and on the seventh day shall be a solemn assembly to the LORD thy God. Thou shalt do no work therein.
Nehemiah 8:18
Also day by day, from the first day unto the last day, he read in the Book of the Law of God. And they kept the feast seven days; and on the eighth day was a solemn assembly, according unto the manner.
Joel 1:14
Sanctify ye a fast; call a solemn assembly. Gather the elders and all the inhabitants of the land into the house of the LORD your God, and cry unto the LORD!
seven days
2 Chronicles 30:23
And the whole assembly took counsel to keep another seven days, and they kept another seven days with gladness.
1 Kings 8:65
And at that time Solomon held a feast, and all Israel with him, a great congregation, from the entrance of Hamath unto the River of Egypt, before the LORD our God seven days and seven days, even fourteen days.