2 Chronicles 7:8-10

7:8 At that time Solomon and all Israel with him celebrated a festival for seven days. This great assembly included people from Lebo Hamath in the north to the Brook of Egypt in the south. 7:9 On the eighth day they held an assembly, for they had dedicated the altar for seven days and celebrated the festival for seven more days. 7:10 On the twenty-third day of the seventh month, Solomon sent the people home. They left happy and contented because of the good the Lord had done for David, Solomon, and his people Israel.

Leviticus 23:34-36

23:34 “Tell the Israelites, ‘On the fifteenth day of this seventh month is the Festival of Temporary Shelters for seven days to the Lord. 23:35 On the first day is a holy assembly; you must do no regular work. 23:36 For seven days you must present a gift to the Lord. On the eighth day there is to be a holy assembly for you, and you must present a gift to the Lord. It is a solemn assembly day; you must not do any regular work.

Leviticus 23:1

Regulations for Israel’s Appointed Times

23:1 The Lord spoke to Moses:

Leviticus 8:2

8:2 “Take Aaron and his sons with him, and the garments, the anointing oil, the sin offering bull, the two rams, and the basket of unleavened bread,