Joseph Benson's Commentary of the Old and New Testaments - Numbers 29:12
Numbers 29:12. The eighth and last of these national sacrifices, which was also annual, was to be at the feast of tabernacles, to be observed on the fifteenth day of this same seventh month, in solemn commemoration of their travels in the wilderness, and as a thanksgiving for their happy settlement in the land of Canaan: see Leviticus 23:34. Seven days Not by abstaining so long from all servile work, but by offering extraordinary sacrifices each day. For all the seven days of their dwelling... read more
Albert Barnes' Notes on the Whole Bible - Numbers 29:35-38
The offerings prescribed for the closing day of the Feast of tabernacles were the same with those appointed for the Feast of Trumpets and the Day of Atonement. The solemnities of the month thus terminated, asA whole, with the same sacrifices with which, three weeks before, they had been introduced; and the Day of Atonement, even though succeeded by the rejoicings of the Feast of tabernacles, thus left its impress on the whole month. read more