Numbers 29

1 a holy convocation. The “trumpets” heralded the month in which fell the Day of Atonement and the Feast of Tabernacles. The days of holy convocation (see also the preceding chapter) would concur with the weekly Sabbath in promoting the knowledge of God and attention to His services.

11 a sin offering. This was besides the great annual sin offering of atonement (Lev. xvi.); signifying the imperfection of the sacrifices under the law, and their insufficiency to take away sin.