Matthew Poole and continuators on Leviticus 25:9

9 Then shalt thou cause the trumpet of the jubilee to sound on the tenth day of the seventh month, in the day of atonement shall ye make the trumpet sound throughout all your land.

Which signified the true liberty from our spiritual debts and slaveries to be purchased by Christ and to be published to the World by the sound of the Gospel.

Which was the first month of the year for civil and worldly affairs, which were mainly concerned in the Jubilee. And therefore it began in that moneth, and, as it seems, upon this very tenth day, when the trumpet sounded, as other feasts generally began when the trumpet sounded.

A very fit time, that when they fasted and prayed for Gods mercy to them in the pardon of their sins, then they might exercise their Charity and kindness to men in forgiving their debts, which is the true fast, as is noted, Isa. 58. 6. and to teach us, that the foundation of all solid comfort and joy must be laid in bitter Repentance and atonement for our sins through Christ.

Marginal references: Heb. loud of sound.; chap. 23. 27.