Charles Ellicott Commentary 1 Kings 8:65-66

"So Solomon held the feast at that time, and all Israel with him, a great assembly, from the entrance of Hamath unto the brook of Egypt, before Jehovah our God, seven days and seven days, even fourteen days. On the eighth day he sent the people away; and they blessed the king, and went unto their tents joyful and glad of heart for all the goodness that Jehovah had showed unto David his servant, and to Israel his people." — 1 Kings 8:65-66 (ASV)

Seven days and seven days, even fourteen days. On the eighth day... —The origin of this curious phrase is singularly illustrated by the account in 2 Chronicles 7:9–10, for it tells us that the people were dismissed on the three and twentieth day of the month, which was the day after the close of the Feast of Tabernacles. Hence it is clear that the festival week of the Dedication preceded the regular feast; and the day of dismissal was the “eighth day,” regularly so-called, of the close of the Feast of Tabernacles.

Unto their tents. —The old memory of the wandering life of Israel still lingers in this expression, as in the well-known phrase To your tents, O Israel! (2 Samuel 20:1; 1 Kings 12:16). It may have been suggested to the writer in this place by the ideas symbolised in the Feast of Tabernacles, of which he had just recorded the observance.