Numbers 29:12 - Joseph Benson’s Commentary on the Old and New Testaments

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 in booths they were to offer sacrifices. And while we are in these tabernacles, it is our duty and interest to keep up our communion with God. Nor will the unsettledness of our outward condition excuse our neglect of God's worship.