Leviticus 23:34 - Albert Barnes' Notes on the Bible

Seven days - Like the Passover, the feast of tabernacles commenced at the full moon, on the fifteenth day of the month, and lasted for seven days. The week of the feast was followed by an eighth day, forming strictly no part of it Leviticus 23:36, Numbers 29:35; Nehemiah 8:18, which was a day of holy convocation, and appears to have been generally distinguished by the word translated “solemn assembly” Deuteronomy 16:8; 2 Kings 10:20; Isaiah 1:13; Joel 1:14; Joel 2:15. From its derivation the word in the original appears strictly to denote a closing festival, and this rendering would apply with the most perfect fitness to the day after the week of the Feast of tabernacles, as the conclusion of the series of yearly festivals.