2 Chronicles 30:23

"And the whole assembly took counsel to keep other seven days: and they kept other seven days with gladness."

Cross References (ranked by relevance)

And at that time Solomon held a feast, and all Israel with him, a great congregation, from the entering in of Hamath unto the river of Egypt, before the LORD our God, seven days and seven days, even fourteen days.

2 Chronicles 7:9

And in the eighth day they made a solemn assembly: for they kept the dedication of the altar seven days, and the feast seven days.