Wherefore

1 Kings 8:2
And all the men of Israel came together to King Solomon at the feast in the seventh month, the month of Ethanim.

2 Chronicles 7:8-10
So at that time Solomon and all Israel with him--a very great assembly of people from Lebo-hamath to the Brook of Egypt--observed the feast for seven days. . . .

Leviticus 23:34-36
"Speak to the Israelites and say, 'On the fifteenth day of the seventh month the Feast of Tabernacles to the LORD begins, and it continues for seven days. . . .

1 Kings 8:2
And all the men of Israel came together to King Solomon at the feast in the seventh month, the month of Ethanim.