2 Chronicles 7:9

And in the eighth day — That is, on the twenty-second of the seventh month (Ethanim, or Tisri; 2 Chronicles 5:3).

They made a solemn assembly. — Comp. Leviticus 23:36. Not mentioned in Kings (1 Kings 8:66 says: “and on the eighth day he dismissed the people,” i.e., after this final gathering).

For they kept the dedication of the altar seven days. — The seven days preceding the first day of the Feast of Tabernacles, or the 8th to the 14th Ethanim, had been kept as an extraordinary festival on account of the inauguration of the Temple. After this festival, the Feast of Tabernacles was celebrated in due course for seven days more.

This explains the obscure words of 1 Kings 8:65, “(Solomon and all Israel) kept the feast... seven days and seven days, fourteen days,” a brief expression which combines the two distinct celebrations. So Syriac, “seven days of the feast, and seven days of the inauguration of the house; these and these, their amount was fourteen days. And on the day of the full moon in the month of Tisri the king sent the people away.”